feat: implement statement/execution timeout session variable

[lyang24]

I hereby agree to the terms of the GreptimeDB CLA.

Refer to a related PR or issue link (optional)

#4760

What's changed and what's your intention?

• Summarize your change (mandatory):
  This pr implements session variables for query timeout - the show and set dialects are supported.

• How does this PR work? Need a brief introduction for the changed logic (optional)
  The query timeouts are per session and its implemented with applying a tokio timeout to the query processing function

• need to write test for show/set new session variables.

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 51.08696% with 90 lines in your changes missing coverage. Please review.

Project coverage is 83.74%. Comparing base (22f31f5) to head (24648ba).
Report is 25 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4792      +/-   ##
==========================================
- Coverage   84.05%   83.74%   -0.31%     
==========================================
  Files        1142     1144       +2     
  Lines      211545   213654    +2109     
==========================================
+ Hits       177804   178929    +1125     
- Misses      33741    34725     +984     

[shuiyisong]

Nice work 👍

The input with time unit of PostgreSQL seems not implemented, would you like to implement it in this PR?

Also, it would be better to add time unit while outputting the variable value to the client. Here is an example in PostgreSQL:

postgres=# SHOW statement_timeout;
 statement_timeout
-------------------
 100ms
(1 row)

[lyang24]

Nice work 👍

The input with time unit of PostgreSQL seems not implemented, would you like to implement it in this PR?

Also, it would be better to add time unit while outputting the variable value to the client. Here is an example in PostgreSQL:

postgres=# SHOW statement_timeout;
 statement_timeout
-------------------
 100ms
(1 row)

Thank you for the feedbacks, I added an implementation of postgres time unit support in the newer iteration of the pr.

[evenyag]

Please resolve the conflicts. You might need to merge the latest main branch.

[evenyag]

Others LGTM

[killme2008]

Good job! Is it ready for review? @lyang24