feat: add configuration for tls watch option

[sunng87]

I hereby agree to the terms of the GreptimeDB CLA

What's changed and what's your intention?

This patch adds configuration item watch to TlsOption to control notify behaviour.

part 2 of #3335 , Fixes #3255

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR does not require documentation updates.

Refer to a related PR or issue link (optional)

[codecov]

Codecov Report

Attention: Patch coverage is 94.28571% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 84.54%. Comparing base (b1e290f) to head (14e839a).
Report is 19 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3395      +/-   ##
==========================================
- Coverage   85.68%   84.54%   -1.14%     
==========================================
  Files         893      899       +6     
  Lines      147382   148982    +1600     
==========================================
- Hits       126285   125959     -326     
- Misses      21097    23023    +1926     

[sunng87]

Ignore the coverage error because this patch is mainly for test and doesn't introduce anything big. It might be a coverage error I think.

[tisonkun]

Ignore the coverage error because this patch is mainly for test and doesn't introduce anything big. It might be a coverage error I think.

Exactly why I don't like Codecov 🤣

[tisonkun]

Minor comment on naming.