Support etcd client authentication

[hailin0]

Set authentication parameters from startup command

Fix apache/skywalking#9187

• Add a unit test to verify that the fix works.
• Explain briefly why the bug exists and how to fix it.

Support set etcd authentication parameters from startup command

• If this pull request closes/resolves/fixes an existing issue, replace the issue number. Fixes [Feature] Enhance etcd auth configuration skywalking#9187.
• Update the CHANGES log.

[hailin0]

reference
https://github.com/etcd-io/etcd/blob/9ec5f981894063d13fdc5cfc60933c515ab6c6c2/tests/integration/clientv3/examples/example_test.go#L58

[codecov-commenter]

Codecov Report

Merging #331 (a9acb9c) into main (81011a4) will decrease coverage by 0.01%.
The diff coverage is 36.58%.

@@            Coverage Diff             @@
##             main     #331      +/-   ##
==========================================
- Coverage   39.32%   39.31%   -0.01%     
==========================================
  Files         112      112              
  Lines       12329    12370      +41     
==========================================
+ Hits         4848     4863      +15     
- Misses       7003     7029      +26     
  Partials      478      478              

Files	Coverage Δ
banyand/metadata/client.go	47.23% <100.00%> (+2.72%)	⬆️
banyand/metadata/schema/etcd.go	47.57% <21.21%> (-3.16%)	⬇️

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[hanahmily]

You should create test cases to ensure the added items are verified. You can utilize "test/integration/distributed/setup/node_test.go" as a reference for writing the test cases.

[hailin0]

You should create test cases to ensure the added items are verified. You can utilize "test/integration/distributed/setup/node_test.go" as a reference for writing the test cases.

@hanahmily please help to review

[hailin0]

@hanahmily PTAL