feat: show flow's mem usage in INFORMATION_SCHEMA.FLOWS

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What's changed and what's your intention?

Add a column to show flow's mem usage in system table, so one can tune flow's ttl option as needed.

Please explain IN DETAIL what the changes are in this PR and why they are needed:

in distributed mode Flownode's heartbeat task will reguarly ask for a StateReport which include all flows' mem usage data, and send them to metasrv, then metasrv can use this info to build system table, however there is a small latency in data update since heartbeat duration is in seconds but this usually is ok since flow's mem usage grow very slowly usually. In standalone mode can just query flow's mem size

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 20.93023% with 340 lines in your changes missing coverage. Please review.

Project coverage is 83.81%. Comparing base (758ad0a) to head (d417837).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4890      +/-   ##
==========================================
- Coverage   84.19%   83.81%   -0.39%     
==========================================
  Files        1137     1139       +2     
  Lines      209796   210217     +421     
==========================================
- Hits       176646   176198     -448     
- Misses      33150    34019     +869