[Feature][SDK] Fix the issue of inconsistent capitalization of Function names in FunctionalTools

[Zkplo]

Description

• parent issue [Umbrella] Tencent Rhino-bird: Expand InLong Transform functions #10796

Due to the fact that the names of each function are in lowercase, if there are uppercase function names passed in SQL, the corresponding function cannot be found.

    public static ValueParser getTransformFunction(Function func) {
        if (func == null) {
            return null;
        }
        String functionName = func.getName(); // Inconsistent capitalization
        Class<?> clazz = functionMap.get(functionName);
        .......
    }

Use case

No response

Are you willing to submit PR?

• Yes, I am willing to submit a PR!

Code of Conduct

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