multiline: introduce static cri parser backend, providing 9mb/s performance gain over current regex cri parser

[ryanohnemus]

As part of #9399, I have been looking into performance improvements in fluent-bit. Specifically for apps in k8s that are creating many logs within a short amount of time (ie logging >15mb/s).

Test setup:
Hardware: GCP n2-standard-8 w/ ssd bootdisk
With config: (see full config in example config section)

  inputs:
    - name: tail
      path: /app/cache/containers/*.log
      tag: kube.*
      skip_long_lines: on
      refresh_interval: 1
      buffer_chunk_size: 250K
      buffer_max_size: 250K
      threaded: on
      rotate_wait: 300
      storage.type: filesystem
  outputs:
    - name: "null"
      match: "*"
      workers: 3

1. with no multiline.parser: cri (or any parser present) - i am able to achieve - 49.224Mb/s throughput
2. adding a standard cri parser - regex (current) version - fluent-bit 3.1.8

• multiline.parser: cri added to tail input above - throughput is 18.571Mb/s

3. using the cri parser from this PR -

• multiline.parser: criadded to tail input above - throughput is 27.572Mb/s ~9mb/s gain by not using a regex parser

Improving the multiline parsing speed should also considerably cut down on issues from log tail rotations (log rotations missed when fluentbit is backed up), since parsing is much more performant.

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Testing
Before we can approve your change; please submit the following in a comment:

• [X ] Example configuration file for the change
  Using the k8s_perf_test from Performance Testing of Fluent-bit with several filters shows log processing falling < 5mb/s #9399 with the following service config:

service:
  flush: 0.5
  log_level: info
  daemon: off
  parsers_file: parsers.conf
  http_server: on
  http_listen: 0.0.0.0
  http_port: 2030
  storage.metrics: on
  storage.path: /app/cache/flb_storage
  storage.backlog.mem_limit: 512M
  storage.delete_irrecoverable_chunks: on
  storage.total_limit_size: 25G
pipeline:
  inputs:
    - name: tail
      path: /app/cache/containers/*.log
      tag: kube.*
      skip_long_lines: on
      refresh_interval: 1
      buffer_chunk_size: 250K
      buffer_max_size: 250K
      threaded: on
      multiline.parser: cri
      rotate_wait: 300
      storage.type: filesystem
  outputs:
    - name: "null"
      match: "*"
      workers: 3

• Debug log output from testing the change

• Attached Valgrind output that shows no leaks or memory corruption was found

valgrind --leak-check=full ./bin/flb-it-multiline
...

SUCCESS: All unit tests have passed.
==45752== 
==45752== HEAP SUMMARY:
==45752==     in use at exit: 0 bytes in 0 blocks
==45752==   total heap usage: 22,203 allocs, 22,203 frees, 7,605,275 bytes allocated
==45752== 
==45752== All heap blocks were freed -- no leaks are possible
==45752== 
==45752== Use --track-origins=yes to see where uninitialised values come from
==45752== For lists of detected and suppressed errors, rerun with: -s
==45752== ERROR SUMMARY: 32 errors from 2 contexts (suppressed: 0 from 0)

If this is a change to packaging of containers or native binaries then please confirm it works for all targets.

• [N/A] Run local packaging test showing all targets (including any new ones) build.
• [N/A] Set ok-package-test label to test for all targets (requires maintainer to do).

Documentation

• [N/A] Documentation required for this feature
• no new documentation, parser is meant to be backward compatible