[INLONG-10883][SDK] Transform SQL support InitCap function

[MOONSakura0614]

Fixes #10883

Motivation

Add a function class: InitCapFunction and its unit test.

• initcap(string)
  Returns a new form of STRING with the first character of each word converted to uppercase and the rest characters to lowercase. Here a word means a sequences of alphanumeric characters.

Modifications

Verifying this change

(Please pick either of the following options)

• This change is a trivial rework/code cleanup without any test coverage.

• This change is already covered by existing tests, such as:
  (please describe tests)

• This change added tests and can be verified as follows:

  (example:)

  • Added integration tests for end-to-end deployment with large payloads (10MB)
  • Extended integration test for recovery after broker failure

Documentation

• Does this pull request introduce a new feature? (yes / no)
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)
• If a feature is not applicable for documentation, explain why?
• If a feature is not documented yet in this PR, please create a follow-up issue for adding the documentation

[github-actions]

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[aloyszhang]

plz rebase the master to resolve the conflict

[dockerzhang]

@MOONSakura0614 please fix the conflicts and failed workflows.

[MOONSakura0614]

@MOONSakura0614 please fix the conflicts and failed workflows.

already resolve the conflicts and force push.
Your careful review is much appreciated.

[MOONSakura0614]

plz rebase the master to resolve the conflict

done and thank you for checking again.

[dockerzhang]

@MOONSakura0614 please fix the conflicts and failed workflows.

[MOONSakura0614]

@MOONSakura0614 please fix the conflicts and failed workflows.

already fix the conflicts and failed workflows by force-push.

[MOONSakura0614]

@aloyszhang Sorry for another review. Because I forget the pr "return "" if param string is null", I expected "result = null" in unit test which caused failure.
Thank you for your kind checking~

[aloyszhang]

You should rebase the master branch and then force push you branch

[MOONSakura0614]

You should rebase the master branch and then force push you branch

solved