NLB-6350: enable R34 directives

[xynicole]

Proposed changes

Manually create the config JSON files by comparing the directives, then use the generator to create the directives.gen.go files.
To secure the private link in the public repositories, we will use environment variables.

New directives introduced in R34:
grpc_ssl_certificate_cache
proxy_ssl_certificate_cache (ngx_http_proxy_module/ngx_stream_proxy_module)
ssl_certificate_cache (ngx_http_proxy_module/ngx_stream_proxy_module)
uwsgi_ssl_certificate_cache
ssl_object_cache_inheritable
keepalive_min_timeout

The following directives are added in the context of mgmt block:
proxy 
proxy_username 
proxy_password 

For Native OIDC Module

oidc_provider
auth_oidc
issuer
client_id
client_secret
config_url
cookie_name
extra_auth_args
proxy_location (not in the official doc)
redirect_uri
scope
session_store
session_timeout
ssl_crl
ssl_trusted_certificate 

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING document
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• I have updated any relevant documentation (README.md)