feat(auth): add social login feature (#840)

[qwqcode]

Refer to documentation: https://artalk.js.org/guide/frontend/auth.html

Close #840

[codecov]

Codecov Report

Attention: Patch coverage is 1.46699% with 806 lines in your changes are missing coverage. Please review.

Project coverage is 25.01%. Comparing base (23d0d86) to head (f26922a).

Files	Patch %	Lines
internal/auth/gothic_fiber/gothic_fiber.go	5.44%	191 Missing ⚠️
server/handler/auth_email_send.go	0.00%	91 Missing ⚠️
server/handler/auth_merge_apply.go	0.00%	90 Missing ⚠️
internal/auth/providers.go	0.00%	66 Missing ⚠️
server/handler/auth_social_login.go	0.00%	65 Missing ⚠️
server/handler/auth_email_register.go	0.00%	54 Missing ⚠️
server/handler/auth_email_login.go	0.00%	44 Missing ⚠️
internal/auth/social_register.go	0.00%	27 Missing ⚠️
server/handler/auth_merge_check.go	0.00%	26 Missing ⚠️
internal/auth/info.go	0.00%	21 Missing ⚠️
... and 14 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #854      +/-   ##
==========================================
- Coverage   27.53%   25.01%   -2.52%     
==========================================
  Files         182      196      +14     
  Lines        7272     8074     +802     
==========================================
+ Hits         2002     2020      +18     
- Misses       5146     5932     +786     
+ Partials      124      122       -2     

Flag	Coverage Δ
go	25.01% <1.46%> (-2.52%)	⬇️

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