feat(frontend): support user alter

[cnissnzg]

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What's changed and what's your intention?

support alter user syntax in #2643

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)

Refer to a related PR or issue link (optional)

Resolve #3998

[codecov]

Codecov Report

Merging #4261 (cf38974) into main (1da2a3e) will decrease coverage by 0.02%.
The diff coverage is 60.88%.

@@            Coverage Diff             @@
##             main    #4261      +/-   ##
==========================================
- Coverage   74.36%   74.34%   -0.03%     
==========================================
  Files         843      844       +1     
  Lines      121654   121895     +241     
==========================================
+ Hits        90471    90625     +154     
- Misses      31183    31270      +87     

Flag	Coverage Δ
rust	74.34% <60.88%> (-0.03%)	⬇️

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

Impacted Files	Coverage Δ
src/frontend/src/user/user_service.rs	10.14% <0.00%> (-0.63%)	⬇️
src/meta/src/manager/user.rs	83.61% <0.00%> (-5.28%)	⬇️
src/meta/src/rpc/service/user_service.rs	7.85% <0.00%> (-1.16%)	⬇️
src/rpc_client/src/meta_client.rs	0.00% <0.00%> (ø)
src/utils/pgwire/src/pg_response.rs	71.21% <ø> (ø)
src/frontend/src/handler/create_user.rs	88.88% <66.66%> (ø)
src/frontend/src/user/user_manager.rs	64.40% <66.66%> (+16.25%)	⬆️
src/frontend/src/handler/alter_user.rs	78.70% <78.70%> (ø)
src/sqlparser/src/ast/statement.rs	83.71% <82.97%> (+1.08%)	⬆️
src/sqlparser/src/parser.rs	92.21% <87.50%> (-0.03%)	⬇️
... and 7 more

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[yezizp2012]

Please add some e2e test as well.

[yezizp2012]

Please add some test for parser, location: src/sqlparser/tests/testdata.