[feat]: support certificate authentication and add tests

[themanforfree]

Please briefly answer these questions:
based on #648

• what problem are you trying to solve? (or if there's no problem, what's the motivation for this change?)
  support certificate authentication and add tests
• what changes does this pull request make?
  support certificate authentication and add tests
• are there any non-obvious implications of these changes? (does it break compatibility with previous versions, etc)
  no

[codecov]

Codecov Report

Attention: Patch coverage is 74.03315% with 47 lines in your changes are missing coverage. Please review.

Project coverage is 74.69%. Comparing base (6779d42) to head (9ea486b).
Report is 14 commits behind head on master.

Files	Patch %	Lines
crates/xline-test-utils/src/lib.rs	86.07%	2 Missing and 9 partials ⚠️
crates/xline/src/server/xline_server.rs	69.44%	4 Missing and 7 partials ⚠️
crates/utils/src/lib.rs	0.00%	7 Missing and 1 partial ⚠️
crates/xline/src/server/kv_server.rs	16.66%	3 Missing and 2 partials ⚠️
crates/xline/src/storage/auth_store/store.rs	88.88%	0 Missing and 3 partials ⚠️
crates/xline/src/utils/args.rs	0.00%	3 Missing ⚠️
crates/xline/src/server/lock_server.rs	0.00%	2 Missing ⚠️
crates/xline/src/server/auth_server.rs	0.00%	0 Missing and 1 partial ⚠️
crates/xline/src/server/auth_wrapper.rs	0.00%	0 Missing and 1 partial ⚠️
crates/xline/src/server/lease_server.rs	0.00%	0 Missing and 1 partial ⚠️
... and 1 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #652      +/-   ##
==========================================
+ Coverage   74.43%   74.69%   +0.26%     
==========================================
  Files         170      171       +1     
  Lines       24834    25035     +201     
  Branches    24834    25035     +201     
==========================================
+ Hits        18485    18701     +216     
+ Misses       5207     5161      -46     
- Partials     1142     1173      +31     

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[Phoenix500526]

It's better to add an example in quick start to teach users how to use this feature.

[Phoenix500526]

LGTM