feat: support inferencepool v1

[Xunzhuo]

Description

This PR is to add v1 inferencepool support

Related Issues/PRs (if applicable)

Fixes #1032

[mathetake]

I won't review until the upstream API PR lands: kubernetes-sigs/gateway-api-inference-extension#1173

[johnugeorge]

Can we plan this effort in the next work?

[Xunzhuo]

@johnugeorge sure, will schedule sometime to finish this next week

[mathetake]

after this lands, we should raise a PR to https://github.com/kubernetes-sigs/gateway-api-inference-extension/tree/main/conformance/reports/v1.0.0/gateway

[Xunzhuo]

Yes for sure

[mathetake]

@Xunzhuo kindly ping

[Xunzhuo]

will redo this PR after #1239

[mathetake]

ping @Xunzhuo

[mathetake]

@Xunzhuo resolved the huge conflicts for you! I think it should be good to go

[Xunzhuo]

what! cool @mathetake haha, i was scheduling to resolve this at this week, but if it is good to go, let us move this forward

[mathetake]

ah i think the documentation change also needed

[codecov-commenter]

Codecov Report

❌ Patch coverage is 95.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.56%. Comparing base (e3bf5fd) to head (501ff19).

Files with missing lines	Patch %	Lines
tests/internal/e2elib/e2elib.go	0.00%	3 Missing ⚠️

❌ Your project status has failed because the head coverage (77.56%) is below the target coverage (86.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1033   +/-   ##
=======================================
  Coverage   77.56%   77.56%           
=======================================
  Files         123      123           
  Lines       15768    15759    -9     
=======================================
- Hits        12230    12224    -6     
+ Misses       2908     2906    -2     
+ Partials      630      629    -1     

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[Xunzhuo]

i think this is good to go, the ext-proc e2e is not related to this PR(broken by mcp tests)