fix(udf): unlimit external udf message size

[stdrc]

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What's changed and what's your intention?

The previous default 4MB limit by tonic seems too small. After arrow-udf/arrow-udf#62, we can finally increase it to usize::MAX.

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[stdrc]

• fix(udf): unlimit external udf message size #18591 👈
• main

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[kwannoel]

Shall we add a warning trace or metric for udf message with large size? Can be in a separate PR.

[stdrc]

Shall we add a warning trace or metric for udf message with large size? Can be in a separate PR.

It seems not easy to add such log/metric because messages are decoded in tonic and we don't have access to the raw messages. Currently I think we already have UDF Throughput (bytes).