api: add full_duplex_streamed enum to ExtProcBodyProcessingMode

[kfswain]

What type of PR is this?

What this PR does / why we need it:
FULL_DUPLEX_STREAMED is already a supported processing_mode, and was asked to be supported in our project (xref: kubernetes-sigs/gateway-api-inference-extension#388). I am currently using the patch policy to jsonPatch the field in, however it might be a simpler to expose the field via the more robust EnvoyExtensionPolicy
Which issue(s) this PR fixes:

Fixes #

Release Notes: Yes/No

[arkodg]

hey @kfswain can you run make generate to generate the rest of the files
you can unblock yourself for now in v1.3.0 by using processingMode.allowModeOverride
https://gateway.envoyproxy.io/docs/api/extension_types/#extprocprocessingmode
cc @mathetake

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.16%. Comparing base (6afe0c9) to head (8aa3a37).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5349      +/-   ##
==========================================
- Coverage   65.20%   65.16%   -0.05%     
==========================================
  Files         212      212              
  Lines       33677    33678       +1     
==========================================
- Hits        21959    21946      -13     
- Misses      10396    10406      +10     
- Partials     1322     1326       +4     

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[kfswain]

can you run make generate to generate the rest of the files

Yes, apologies, I should have done that before cutting the PR. Done.

you can unblock yourself for now in v1.3.0 by using processingMode.allowModeOverride
https://gateway.envoyproxy.io/docs/api/extension_types/#extprocprocessingmode

Perfect, thank you!

[arkodg]

can we rm the proto file link, if an envoy proxy website link exists, lets add that

[kfswain]

SG! I'll use: https://www.envoyproxy.io/docs/envoy/latest/api-v3/extensions/filters/http/ext_proc/v3/processing_mode.proto.html#enum-extensions-filters-http-ext-proc-v3-processingmode-bodysendmode

But it does seem to be missing a description for FULL_DUPLEX_STREAMED (I figure thats just a minor docs issue that doesnt need to block this PR)

[arkodg]

ah because there's an extra new line in https://github.com/envoyproxy/envoy/blob/cc9188ab83771aa23f54d4cf20e755a9169d9206/api/envoy/extensions/filters/http/ext_proc/v3/processing_mode.proto#L110, would be great if you could raise a PR to fix it

[kfswain]

Yeah np at all, done: envoyproxy/envoy#38578

[arkodg]

@kfswain can you run make generate again and commit those changes

[kfswain]

@kfswain can you run make generate again and commit those changes

Done

[sanjaypujare]

@kfswain the docs still don't show this processing mode yet https://gateway.envoyproxy.io/docs/api/extension_types/#extprocbodyprocessingmode . Does it need to be done separately or is it just a matter of time (doc release process etc)?

[arkodg]

@sanjaypujare its hasnt released yet, will be part of v1.4 / end April, its only part of the latest release https://gateway.envoyproxy.io/latest/api/extension_types/#extprocbodyprocessingmode