feat(frontend): support basic CREATE / DROP FUNCTION

[wangrunji0408]

I hereby agree to the terms of the Singularity Data, Inc. Contributor License Agreement.

What's changed and what's your intention?

This PR adds necessary code to frontend to support basic CREATE FUNCTION and DROP FUNCTION statement.

The supported syntax of CREATE FUNCTION is a subset of postgres':

create function func(int, int) returns int as 'http://localhost:8815' language arrow_flight;

This PR only stores the given information in catalog. They will be used to connect the external function service in the future.

At last, since I'm new to the frontend and not familar with the code, please feel free to point out anything I have missed. Thanks! 🥹

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)

[chenzl25]

LGTM! This PR establishes the basic logic of creating and dropping functions.

[codecov]

Codecov Report

Merging #7265 (6868c61) into main (53e33b5) will decrease coverage by 0.17%.
The diff coverage is 15.03%.

@@            Coverage Diff             @@
##             main    #7265      +/-   ##
==========================================
- Coverage   73.19%   73.02%   -0.18%     
==========================================
  Files        1058     1063       +5     
  Lines      169375   169707     +332     
==========================================
- Hits       123980   123921      -59     
- Misses      45395    45786     +391     

Flag	Coverage Δ
rust	73.02% <15.03%> (-0.18%)	⬇️

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

Impacted Files	Coverage Δ
src/common/common_service/src/observer_manager.rs	43.56% <ø> (ø)
src/common/src/catalog/mod.rs	58.25% <0.00%> (-13.18%)	⬇️
src/common/src/types/mod.rs	72.46% <0.00%> (-0.24%)	⬇️
src/expr/src/expr/expr_udf.rs	0.00% <0.00%> (ø)
src/expr/src/expr/mod.rs	41.07% <0.00%> (-0.75%)	⬇️
src/frontend/src/catalog/catalog_service.rs	6.06% <0.00%> (-0.40%)	⬇️
src/frontend/src/catalog/function_catalog.rs	0.00% <0.00%> (ø)
src/frontend/src/catalog/mod.rs	75.00% <ø> (ø)
src/frontend/src/expr/expr_mutator.rs	52.08% <0.00%> (-8.90%)	⬇️
src/frontend/src/expr/expr_rewriter.rs	52.22% <0.00%> (-5.81%)	⬇️
... and 32 more

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