feat: Add support for exporting APIs as .http files

[tangcent]

No description provided.

[codecov]

Codecov Report

Merging #1076 (83c4136) into master (d759761) will increase coverage by 0.010%.
The diff coverage is 60.417%.

Additional details and impacted files

@@               Coverage Diff               @@
##              master     #1076       +/-   ##
===============================================
+ Coverage     61.918%   61.928%   +0.010%     
- Complexity      2250      2283       +33     
===============================================
  Files            246       249        +3     
  Lines          11932     12077      +145     
  Branches        2937      2982       +45     
===============================================
+ Hits            7388      7479       +91     
- Misses          2971      3001       +30     
- Partials        1573      1597       +24     

Flag	Coverage Δ
unittests	61.928% <60.417%> (+0.010%)	⬆️

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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