fix(auth)!: 拆分getUser为独立的认证系统能力

[ddadaal]

经过进一步考虑，发现getUser应该是一个独立的认证系统能力。有的认证系统不支持创建用户，但是支持查询用户是否存在，比如SSH。有的认证系统支持创建用户，但是不支持查询用户是否存在，比如一些机构的内部认证系统，内部认证系统基本不会给接入者随便查询任意用户的能力。所以getUser应该不是和创建用户的绑定的接口，而是一个独立的能力。

[codecov-commenter]

Codecov Report

Base: 64.38% // Head: 64.60% // Increases project coverage by +0.22% 🎉

Coverage data is based on head (f0fdc18) compared to base (9315a08).
Patch coverage: 75.29% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #314      +/-   ##
==========================================
+ Coverage   64.38%   64.60%   +0.22%     
==========================================
  Files          99      100       +1     
  Lines        2802     2811       +9     
  Branches      349      348       -1     
==========================================
+ Hits         1804     1816      +12     
+ Misses        953      950       -3     
  Partials       45       45              

Impacted Files	Coverage Δ
apps/auth/src/routes/capabilities.ts	75.00% <ø> (ø)
apps/auth/src/routes/getUser.ts	84.61% <50.00%> (ø)
apps/auth/src/auth/ldap/createUser.ts	67.85% <67.85%> (ø)
libs/auth/src/getUser.ts	85.71% <85.71%> (ø)
apps/auth/src/auth/ldap/index.ts	46.87% <100.00%> (-9.92%)	⬇️
apps/auth/src/auth/ssh/index.ts	67.85% <100.00%> (+8.76%)	⬆️
apps/auth/src/routes/createUser.ts	83.33% <100.00%> (ø)
libs/auth/src/createUser.ts

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