performance: optimize by protobuf context-type.

[qicz]

What type of PR is this?

What this PR does / why we need it:

Which issue(s) this PR fixes:

replace #1596
Fixes #

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 65.56%. Comparing base (e043978) to head (8832ae1).
Report is 32 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/kubernetes/config.go	69.23%	3 Missing and 1 partial ⚠️
internal/infrastructure/manager.go	0.00%	1 Missing ⚠️
internal/provider/runner/runner.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4282      +/-   ##
==========================================
- Coverage   65.64%   65.56%   -0.09%     
==========================================
  Files         197      198       +1     
  Lines       23534    23555      +21     
==========================================
- Hits        15450    15443       -7     
- Misses       6975     7007      +32     
+ Partials     1109     1105       -4     

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[zirain]

is there before-and-after data comparison?

[qicz]

/retest

[qicz]

the gateway API does not support protobuf. raised issue kubernetes-sigs/gateway-api#3346
the same for EG. #4283

[qicz]

xref: #4283 (comment)
#4283 (comment)

EG has already supported multi content-type by controller-runtime