feat(frontend): add pg_catalog.pg_views and support \dv

[HuaHuaY]

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What's changed and what's your intention?

1. add pg_catalog.pg_views.
2. modify pg_catalog.pg_class to support \dv
3. small refactoring in struct DatabaseManager and macro prepare_sys_catalog.

Notice

Because we mark all system catalogs as table in RisingWave, but PostgreSQL's system catalogs are divided into tables and views, the output of pg_views is different from PostgreSQL's. pg_views doesn't contain information about system catalogs.

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

Release note

1. support \dv.
2. add pg_catalog.pg_views(PostgreSQL's doc: https://www.postgresql.org/docs/current/view-pg-views.html).
   The view pg_views provides access to useful information about each view in the database.

Refer to a related PR or issue link (optional)

close #6118

[lmatz]

LGTM!

#6118 My mistake, \dv actually does not go through pg_views 😅 but for other usage

[yezizp2012]

LGTM

[codecov]

Codecov Report

Merging #6295 (b347461) into main (23880ab) will decrease coverage by 0.03%.
The diff coverage is 63.88%.

@@            Coverage Diff             @@
##             main    #6295      +/-   ##
==========================================
- Coverage   74.38%   74.34%   -0.04%     
==========================================
  Files         950      953       +3     
  Lines      153750   154348     +598     
==========================================
+ Hits       114360   114753     +393     
- Misses      39390    39595     +205     

Flag	Coverage Δ
rust	74.34% <63.88%> (-0.04%)	⬇️

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

Impacted Files	Coverage Δ
src/common/src/array/mod.rs	88.79% <ø> (ø)
src/common/src/types/chrono_wrapper.rs	62.56% <0.00%> (-5.73%)	⬇️
src/common/src/types/decimal.rs	75.63% <0.00%> (-4.96%)	⬇️
src/common/src/types/interval.rs	79.19% <0.00%> (-0.58%)	⬇️
src/common/src/types/mod.rs	66.04% <0.00%> (+2.05%)	⬆️
src/common/src/types/to_binary.rs	0.00% <0.00%> (ø)
src/connector/src/sink/mod.rs	0.00% <0.00%> (ø)
...rc/connector/src/source/kafka/enumerator/client.rs	0.00% <0.00%> (ø)
...ntend/src/catalog/system_catalog/pg_catalog/mod.rs	0.00% <0.00%> (ø)
src/frontend/src/lib.rs	40.00% <ø> (ø)
... and 25 more

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