Add support for --provider kong-gateway to kong2tf

[mheap]

No description provided.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 91.45299% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 36.81%. Comparing base (5912a69) to head (9cba172).

Files with missing lines	Patch %	Lines
kong2tf/generate_resource.go	93.87%	2 Missing and 1 partial ⚠️
cmd/file_convert.go	0.00%	2 Missing ⚠️
cmd/file_kong2tf.go	84.61%	2 Missing ⚠️
kong2tf/builder_default_terraform.go	95.34%	2 Missing ⚠️
cmd/file_format.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2255      +/-   ##
==========================================
+ Coverage   36.00%   36.81%   +0.81%     
==========================================
  Files          82       82              
  Lines        7850     7909      +59     
==========================================
+ Hits         2826     2912      +86     
+ Misses       4756     4728      -28     
- Partials      268      269       +1     

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[harshadixit12]

While reviewing this, found some existing bugs - tracking in #2263