impl for setting OIDC token cookie domain

[zhaohuabing]

This PR introduces the ability to set a domain for OAuth2 filter token cookies. By configuring the domain, these token cookies can be shared across multiple subdomains, enabling users to remain logged in while navigating between mulitple subdomains without the need for repeated logins.

apiVersion: gateway.envoyproxy.io/v1alpha1
kind: SecurityPolicy
metadata:
  name: oidc-example
  namespace: default
spec:
  oidc:
    clientID: 758469837151-2tchi5dn2sh7o5kcc3m974nsfdvjlfpr.apps.googleusercontent.com
    clientSecret:
      group: ""
      kind: Secret
      name: my-app-client-secret
    cookieDomain: example.com
    logoutPath: /myapp/logout
    provider:
      issuer: https://accounts.google.com
    redirectURL: https://www.example.com:8443/myapp/oauth2/callback
  targetRefs:
  - group: gateway.networking.k8s.io
    kind: Gateway
    name: eg

Related issue: #3919
Envoy PRs: envoyproxy/envoy#35491 envoyproxy/envoy#35845

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.99%. Comparing base (5998980) to head (342efd9).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4102      +/-   ##
==========================================
+ Coverage   67.95%   67.99%   +0.04%     
==========================================
  Files         189      189              
  Lines       23103    23106       +3     
==========================================
+ Hits        15699    15711      +12     
+ Misses       6281     6277       -4     
+ Partials     1123     1118       -5     

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[arkodg]

LGTM thanks !