feat: OIDC wasm plugin

[Jing-ze]

Ⅰ. Describe what this PR did

Fork the oauth2proxy(https://github.com/oauth2-proxy/oauth2-proxy) and modify it into a wasm plugin

Ⅱ. Does this pull request fix one issue?

fixes #697.

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[CLAassistant]

All committers have signed the CLA.

[johnlanni]

@Jing-ze 把oauth2 proxy相关的代码独立出来吧啊，提交到这里：https://github.com/higress-group/oauth2-proxy

这样也能看到为了适配 wasm 场景，对 oauth2 proxy 做了哪些改动

[Jing-ze]

@Jing-ze 把oauth2 proxy相关的代码独立出来吧啊，提交到这里：https://github.com/higress-group/oauth2-proxy

这样也能看到为了适配 wasm 场景，对 oauth2 proxy 做了哪些改动

higress-group/oauth2-proxy#1

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 44.23%. Comparing base (ef31e09) to head (f4092cb).
Report is 60 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1049      +/-   ##
==========================================
+ Coverage   35.91%   44.23%   +8.32%     
==========================================
  Files          69       75       +6     
  Lines       11576     9821    -1755     
==========================================
+ Hits         4157     4344     +187     
+ Misses       7104     5148    -1956     
- Partials      315      329      +14     

see 90 files with indirect coverage changes

[johnlanni]

LGTM