chore(libsinsp): remove unused plugin table API functions

[irozzo-1A]

What type of PR is this?

Uncomment one (or more) /kind <> lines:

/kind cleanup

Any specific area of the project related to this PR?

Uncomment one (or more) /area <> lines:

/area libsinsp

Does this PR require a change in the driver versions?

No

What this PR does / why we need it:

Clean up unused functions from the table API. Fixes some build warnings.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[poiana]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: irozzo-1A
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[FedeDP]

/milestone 0.21.0
/cc @jasondellaluce

[github-actions]

Perf diff from master - unit tests

    12.09%     +1.69%  [.] sinsp::next
    10.42%     -0.80%  [.] sinsp_parser::reset
     4.00%     -0.58%  [.] gzfile_read
     2.85%     +0.42%  [.] sinsp_evt::load_params
     2.12%     -0.36%  [.] next
     5.32%     -0.31%  [.] next_event_from_file
     1.35%     +0.30%  [.] scap_event_decode_params
     8.02%     -0.29%  [.] sinsp_evt::get_type
     2.53%     +0.27%  [.] sinsp_parser::process_event
     1.21%     -0.27%  [.] sinsp_parser::event_cleanup

Heap diff from master - unit tests

peak heap memory consumption: 0B
peak RSS (including heaptrack overhead): 0B
total memory leaked: 0B

Heap diff from master - scap file

peak heap memory consumption: 0B
peak RSS (including heaptrack overhead): 0B
total memory leaked: 0B

Benchmarks diff from master

Comparing gbench_data.json to /root/actions-runner/_work/libs/libs/build/gbench_data.json
Benchmark                                                         Time             CPU      Time Old      Time New       CPU Old       CPU New
----------------------------------------------------------------------------------------------------------------------------------------------
BM_sinsp_split_mean                                            -0.0343         -0.0342           152           147           152           147
BM_sinsp_split_median                                          -0.0396         -0.0396           153           147           153           147
BM_sinsp_split_stddev                                          -0.5210         -0.5208             2             1             2             1
BM_sinsp_split_cv                                              -0.5040         -0.5039             0             0             0             0
BM_sinsp_concatenate_paths_relative_path_mean                  -0.0787         -0.0786            62            57            62            57
BM_sinsp_concatenate_paths_relative_path_median                -0.0837         -0.0836            62            57            62            57
BM_sinsp_concatenate_paths_relative_path_stddev                -0.8625         -0.8623             1             0             1             0
BM_sinsp_concatenate_paths_relative_path_cv                    -0.8507         -0.8505             0             0             0             0
BM_sinsp_concatenate_paths_empty_path_mean                     -0.0021         -0.0022            24            24            24            24
BM_sinsp_concatenate_paths_empty_path_median                   -0.0025         -0.0025            24            24            24            24
BM_sinsp_concatenate_paths_empty_path_stddev                   -0.2754         -0.2771             0             0             0             0
BM_sinsp_concatenate_paths_empty_path_cv                       -0.2739         -0.2755             0             0             0             0
BM_sinsp_concatenate_paths_absolute_path_mean                  -0.0656         -0.0656            61            57            61            57
BM_sinsp_concatenate_paths_absolute_path_median                -0.0772         -0.0772            62            57            62            57
BM_sinsp_concatenate_paths_absolute_path_stddev                -0.8775         -0.8777             2             0             2             0
BM_sinsp_concatenate_paths_absolute_path_cv                    -0.8689         -0.8692             0             0             0             0
BM_sinsp_split_container_image_mean                            -0.0400         -0.0399           404           388           404           388
BM_sinsp_split_container_image_median                          -0.0406         -0.0405           405           388           405           388
BM_sinsp_split_container_image_stddev                          +0.6981         +0.6985             2             3             2             3
BM_sinsp_split_container_image_cv                              +0.7688         +0.7690             0             0             0             0

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.29%. Comparing base (356d27a) to head (4cea338).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2269   +/-   ##
=======================================
  Coverage   75.29%   75.29%           
=======================================
  Files         279      279           
  Lines       34389    34389           
  Branches     5878     5878           
=======================================
  Hits        25893    25893           
  Misses       8496     8496           

Flag	Coverage Δ
libsinsp	75.29% <ø> (ø)

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