feat: invoke handle_batch_open_requests

[WenyXu]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

close #4026

What's changed and what's your intention?

Via invoking handle_batch_open_requests, which allows the database to read the WAL entries once, to open all regions sharing the same WAL topic.

Checklist

• I have written the necessary rustdoc comments.
• I have added the necessary unit tests and integration tests.
• This PR requires documentation updates.

[codecov]

Codecov Report

Attention: Patch coverage is 78.62595% with 28 lines in your changes missing coverage. Please review.

Project coverage is 85.13%. Comparing base (c23f8ad) to head (c0771ac).
Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4107      +/-   ##
==========================================
- Coverage   85.46%   85.13%   -0.34%     
==========================================
  Files         993      994       +1     
  Lines      173751   174093     +342     
==========================================
- Hits       148495   148210     -285     
- Misses      25256    25883     +627     

[fengjiachun]

Will definitely be LGTM