[Feature] Support replacing UDF in-place with CREATE OR REPLACE FUNCTION

[digitalpoetry]

Why I'm doing:

As of current, replacing a UDF is a two-step operation: DROP FUNCTION, then CREATE FUNCTION. This method involves potential downtime between the two commands for the function that is being replaced.

What I'm doing:

Fixes StarRocks#46253

This change supports the following

CREATE OR REPLACE FUNCTION function_name RETURNS return_type;

The overall syntax for the enhanced CREATE FUNCTION command will look like this:

CREATE [OR REPLACE] [GLOBAL] [AGGREGATE | TABLE] FUNCTION function_name
(arg_type [, ...])
RETURNS return_type
PROPERTIES ("key" = "value" [, ...]);

What type of PR is this:

• BugFix
• Feature
• Enhancement
• Refactor
• UT
• Doc
• Tool

Does this PR entail a change in behavior?

• Yes, this PR will result in a change in behavior.
• No, this PR will not result in a change in behavior.

If yes, please specify the type of change:

• Interface/UI changes: syntax, type conversion, expression evaluation, display information
• Parameter changes: default values, similar parameters but with different default values
• Policy changes: use new policy to replace old one, functionality automatically enabled
• Feature removed
• Miscellaneous: upgrade & downgrade compatibility, etc.

Checklist:

• I have added test cases for my bug fix or my new feature
• This pr needs user documentation (for new or modified features or behaviors)
  • I have added documentation for my new feature or new function
• This is a backport pr

Bugfix cherry-pick branch check:

• I have checked the version labels which the pr will be auto-backported to the target branch
  • 3.3
  • 3.2
  • 3.1
  • 3.0
  • 2.5

[digitalpoetry]

Merged in StarRocks#46122