feat: implement Scalar UDF

[KKould]

I hereby agree to the terms of the CLA available at: https://docs.databend.com/dev/policies/cla/

Summary

This scalar UDF feature encapsulates SQL as a scalar function, allowing it to be used in a similar way to a built-in function.

CREATE OR REPLACE FUNCTION bool_not(b BOOLEAN) RETURNS BOOLEAN AS $$ NOT b $$;

SELECT bool_not(1 = 0);

Scalar UDF has almost the same functionality as the existing Lambda UDF, but the syntax of Scalar UDF is aligned with UDTF #18511.

Tests

• Unit Test
• Logic Test
• Benchmark Test
• No Test - Explain why

Type of change

• Bug Fix (non-breaking change which fixes an issue)
• New Feature (non-breaking change which adds functionality)
• Breaking Change (fix or feature that could cause existing functionality not to work as expected)
• Documentation Update
• Refactoring
• Performance Improvement
• Other (please describe):

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This change is 

[drmingdrmer]

@drmingdrmer reviewed 12 of 18 files at r1, all commit messages.
Reviewable status: 12 of 18 files reviewed, all discussions resolved (waiting on @sundy-li)