feat(frontend): support pg_stat_activity and an workaround of pg_cancel_backend/pg_terminate_backend

[yezizp2012]

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What's changed and what's your intention?

To support superset, implement system table pg_stat_activity and a workaround of pg_cancel_backend/pg_terminate_backend.

Checklist

• I have written necessary rustdoc comments
• I have added necessary unit tests and integration tests
• All checks passed in ./risedev check (or alias, ./risedev c)

Documentation

If your pull request contains user-facing changes, please specify the types of the changes, and create a release note. Otherwise, please feel free to remove this section.

Types of user-facing changes

Please keep the types that apply to your changes, and remove those that do not apply.

• SQL commands, functions, and operators

Introduced a system catalog pg_stat_activity.
Introduced some functions:

• pg_cancel_backend: Cancel a backend's current query. You can execute this against another backend that has exactly the same role as the user calling the function. In all other cases, you must be a superuser.
• pg_terminate_backend: Terminate a backend. You can execute this against another backend that has exactly the same role as the user calling the function. In all other cases, you must be a superuser.
• pg_backend_pid: Process ID of the server process attached to the current session.

Release note

Support system catalog pg_stat_activity, and some functions like: pg_cancel_backend, pg_terminate_backend and pg_backend_pid.

Refer to a related PR or issue link (optional)

A workaround of #6891

[codecov]

Codecov Report

Merging #7274 (7bf2a15) into main (0988ff3) will decrease coverage by 0.01%.
The diff coverage is 22.72%.

@@            Coverage Diff             @@
##             main    #7274      +/-   ##
==========================================
- Coverage   73.02%   73.01%   -0.02%     
==========================================
  Files        1066     1066              
  Lines      170189   170211      +22     
==========================================
- Hits       124279   124277       -2     
- Misses      45910    45934      +24     

Flag	Coverage Δ
rust	73.01% <22.72%> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...ntend/src/catalog/system_catalog/pg_catalog/mod.rs	0.00% <0.00%> (ø)
src/frontend/src/binder/expr/function.rs	80.09% <17.64%> (-2.50%)	⬇️
src/frontend/src/binder/mod.rs	100.00% <100.00%> (ø)
src/frontend/src/catalog/system_catalog/mod.rs	70.31% <100.00%> (+0.47%)	⬆️
src/storage/src/hummock/sstable/bloom.rs	96.59% <0.00%> (-2.28%)	⬇️
src/meta/src/hummock/mock_hummock_meta_client.rs	64.73% <0.00%> (-0.53%)	⬇️
...rc/storage/hummock_sdk/src/filter_key_extractor.rs	92.32% <0.00%> (-0.26%)	⬇️
src/common/src/cache.rs	97.31% <0.00%> (-0.23%)	⬇️
src/object_store/src/object/mod.rs	51.29% <0.00%> (-0.22%)	⬇️
src/storage/src/hummock/sstable_store.rs	64.72% <0.00%> (-0.19%)	⬇️
... and 3 more

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[hzxa21]

Can we also implement a workaround for pg_backend_pid()?
Usage in superset: https://github.com/apache/superset/blob/5b67e0712d5d3c738abf3281e67755af741c5c01/superset/db_engine_specs/postgres.py#L316

Btw, are the changes in dashboard/proto/gen expected?

Rest LGTM

[yezizp2012]

Can we also implement a workaround for pg_backend_pid()? Usage in superset: https://github.com/apache/superset/blob/5b67e0712d5d3c738abf3281e67755af741c5c01/superset/db_engine_specs/postgres.py#L316

Sure, added in this PR.

Btw, are the changes in dashboard/proto/gen expected?

Yes, the changes in dashboard/proto/gen are due to some previously merged PRs that forgot to generate. 🥵