fix(flow): minor fix about count(*)&sink keyword

[discord9]

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?

• fix can't use count(*) in flow creation
• fix SINK should be case insensitive but not

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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[shuiyisong]

Rest LGTM

[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 83.78%. Comparing base (57f31d1) to head (3eba760).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5061      +/-   ##
==========================================
- Coverage   83.93%   83.78%   -0.16%     
==========================================
  Files        1155     1156       +1     
  Lines      216134   216334     +200     
==========================================
- Hits       181418   181258     -160     
- Misses      34716    35076     +360