feat: Add support for exporting APIs as .http files

[tangcent]

No description provided.

[codecov]

Codecov Report

Merging #522 (aa621cc) into master (6a6d9c8) will increase coverage by 0.000%.
The diff coverage is 60.417%.

Additional details and impacted files

@@             Coverage Diff              @@
##              master      #522    +/-   ##
============================================
  Coverage     62.737%   62.737%            
- Complexity      1898      1931    +33     
============================================
  Files            214       217     +3     
  Lines          10246     10391   +145     
  Branches        2492      2537    +45     
============================================
+ Hits            6428      6519    +91     
- Misses          2495      2525    +30     
- Partials        1323      1347    +24     

Flag	Coverage Δ
unittests	62.737% <60.417%> (+<0.001%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...idea/plugin/api/export/http/HttpClientFileSaver.kt	69.231% <69.231%> (ø)
.../idea/plugin/api/export/http/HttpClientExporter.kt	66.667% <66.667%> (ø)
...idea/plugin/api/export/http/HttpClientFormatter.kt	73.171% <73.171%> (ø)
...gcent/idea/plugin/api/export/suv/SuvApiExporter.kt	0.000% <0.000%> (ø)

... and 5 files with indirect coverage changes

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