refactor: add get_storage_path() and get_catalog_and_schema()

[zyy17]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

What's changed and what's your intention?

Add get_storage_path() and get_catalog_and_schema().

Checklist

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

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[codecov]

Codecov Report

Attention: Patch coverage is 98.18182% with 1 line in your changes missing coverage. Please review.

Project coverage is 84.75%. Comparing base (0b13ac6) to head (40ff247).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4397      +/-   ##
==========================================
- Coverage   85.16%   84.75%   -0.41%     
==========================================
  Files        1074     1075       +1     
  Lines      192011   192545     +534     
==========================================
- Hits       163520   163196     -324     
- Misses      28491    29349     +858