Support binding OAuth2 user automatically

[JohnNiang]

What type of PR is this?

/kind improvement
/area core
/milestone 2.20.x

What this PR does / why we need it:

This PR add support for binding OAuth2 user automatically. So we can remove the user-binding page.

Please note that those changes may break the OAuth2 and SocialLogin plugins.

Special notes for your reviewer:

Build OAuth2 plugin from halo-sigs/plugin-oauth2#64 or use plugin-oauth2-1.0.4-SNAPSHOT.zip I built.

• Bind after logging in

1. Log in Halo with username and password method
2. Try to unbind OAuth2 user
3. Bind OAuth2 user again

• Initially bind without logging in

1. Go to login page
2. Log in with OAuth2 method and you will be redirected to login page
3. Log in with username and password method
4. See the result of binding

• Log in with OAuth2 method after binding

1. Go to login page
2. Log in with OAuth2 method and you will be redirected to uc page directly

Does this PR introduce a user-facing change?

支持自动绑定 OAuth2 登录用户

[codecov]

Codecov Report

Attention: Patch coverage is 43.12977% with 149 lines in your changes missing coverage. Please review.

Project coverage is 57.84%. Comparing base (982a45b) to head (5b44e30).
Report is 20 commits behind head on main.

Files with missing lines	Patch %	Lines
...e/user/service/impl/UserConnectionServiceImpl.java	9.09%	40 Missing ⚠️
...tication/oauth2/HaloOAuth2AuthenticationToken.java	0.00%	25 Missing ⚠️
...tication/oauth2/MapOAuth2AuthenticationFilter.java	53.19%	22 Missing ⚠️
...tion/oauth2/DefaultOAuth2LoginHandlerEnhancer.java	30.00%	14 Missing ⚠️
...n/twofactor/TwoFactorAuthenticationEntryPoint.java	43.47%	13 Missing ⚠️
...uth2/WebSessionOAuth2AuthenticationTokenCache.java	14.28%	12 Missing ⚠️
...ain/java/run/halo/app/infra/SchemeInitializer.java	50.00%	6 Missing ⚠️
...fra/exception/OAuth2UserAlreadyBoundException.java	0.00%	6 Missing ⚠️
...un/halo/app/security/LoginHandlerEnhancerImpl.java	0.00%	5 Missing ⚠️
.../java/run/halo/app/infra/config/WebFluxConfig.java	81.25%	3 Missing ⚠️
... and 2 more

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6702      +/-   ##
============================================
- Coverage     58.29%   57.84%   -0.45%     
- Complexity     3963     3988      +25     
============================================
  Files           680      704      +24     
  Lines         23338    23720     +382     
  Branches       1584     1570      -14     
============================================
+ Hits          13604    13721     +117     
- Misses         9108     9379     +271     
+ Partials        626      620       -6     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[sonarqubecloud]

Quality Gate passed

Issues
5 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[ruibaby]

已测试登录和注册之后都可以正常绑定。

/lgtm

[guqing]

/lgtm

[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: guqing

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [guqing]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment