feat: ext auth forward_auth endpoint_mode enhancement

[hanxiantao]

Ⅰ. Describe what this PR did

因为envoy和forward_auth两种endpoint_mode，envoy这种endpoint_mode目前是能拿到原始的requestMethod和requestPath，但forward_auth这种endpoint_mode暂不支持，考虑到鉴权大部分都会涉及requestMethod和requestPath，endpoint_mode为forward_auth时添加了X-Original-Method和X-Original-URI两个请求头

示例如下：
X-Original-Method: POST
X-Original-Uri: /path/to/resource?query=param

Ⅱ. Does this pull request fix one issue?

#1152

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

Ⅳ. Describe how to verify it

apiVersion: extensions.higress.io/v1alpha1
kind: WasmPlugin
metadata:
  name: test
  namespace: higress-system
spec:
  defaultConfig:
    http_service:
      authorization_request:
        allowed_headers:
          - exact: x-auth-version
        headers_to_add:
          x-envoy-header: true
      authorization_response:
        allowed_upstream_headers:
          - exact: x-user-id
          - exact: x-auth-version
      endpoint:
        path: /auth
        request_method: POST
        service_name: ext-auth.static
        service_port: 80
      endpoint_mode: forward_auth
      timeout: 1000
  imagePullSecret: aliyun
  url: >-
    oci://registry.cn-hangzhou.aliyuncs.com/wasm-plugin/wasm-plugin:ext-auth-0.0.85

1）原始请求为POST

认证服务收到的请求头中X-Original-Method为POST，X-Original-Uri为/foo?apikey=9a342114-ba8a-11ec-b1bf-00163e1250b5

2）原始请求为PUT

认证服务收到的请求头中X-Original-Method为PUT，X-Original-Uri为/foo?apikey=9a342114-ba8a-11ec-b1bf-00163e1250b5

Ⅴ. Special notes for reviews

[hanxiantao]

cc @jaggerwang

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 35.95%. Comparing base (ef31e09) to head (a4d7472).
Report is 21 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1180      +/-   ##
==========================================
+ Coverage   35.91%   35.95%   +0.04%     
==========================================
  Files          69       69              
  Lines       11576     9483    -2093     
==========================================
- Hits         4157     3410     -747     
+ Misses       7104     5757    -1347     
- Partials      315      316       +1     

see 67 files with indirect coverage changes

[hanxiantao]

ApiSix的forward-auth插件也做了对应支持，会向认证服务传原始Uri、Method、Host等信息

[CH3CHO]

is?

[hanxiantao]

默认只带上游的Authorization头过去（ endpoint_mode 为 forward_auth 时，会把原始请求的请求路径设置到 X-Original-Uri ，原始请求的HTTP Method设置到 X-Original-Method ），我补充下后面这部分到注释里吧

[hanxiantao]

is?

已调整

[jaggerwang]

可以获取到了，谢谢！

[johnlanni]

LGTM

[CH3CHO]

镜像已更新，地址不变：higress-registry.cn-hangzhou.cr.aliyuncs.com/plugins/ext-auth:1.0.0

[hanxiantao]

@jaggerwang 你这边可以换成官方的镜像地址了