feat: implement Lua EnvoyExtensionPolicy

[rudrakhp]

What type of PR is this?

feat: implement Lua feature in EnvoyExtensionPolicy

What this PR does / why we need it:
Implement API introduced in #4932

Which issue(s) this PR fixes:

Related #4627

Release Notes: No

[rudrakhp]

@arkodg @zhaohuabing Wanted to get an initial buy in regarding the approach while I add more unit tests and E2E, please do review. Thanks!

[codecov]

Codecov Report

Attention: Patch coverage is 63.15789% with 63 lines in your changes missing coverage. Please review.

Project coverage is 66.88%. Comparing base (57d4aa8) to head (f8c84b2).
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/gatewayapi/envoyextensionpolicy.go	63.88%	23 Missing and 3 partials ⚠️
internal/xds/translator/lua.go	67.21%	13 Missing and 7 partials ⚠️
internal/provider/kubernetes/controller.go	0.00%	13 Missing and 1 partial ⚠️
internal/gatewayapi/luavalidator/lua_validator.go	87.50%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #5171    +/-   ##
========================================
  Coverage   66.87%   66.88%            
========================================
  Files         210      212     +2     
  Lines       32979    33159   +180     
========================================
+ Hits        22054    22177   +123     
- Misses       9586     9633    +47     
- Partials     1339     1349    +10     

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[arkodg]

hey @rudrakhp the code looks great !

please feel free to continue with unit tests and e2e