[Feature Request]: Emit warnings when pcollection elements approach or exceed 2GB limits.

[tvalentyn]

What would you like to happen?

We added the warnings in Python SDK: https://github.com/apache/beam/issues/31607#issuecomment-2169043225 but to my knowledge, we don't have them in Java or Go, which might result in confusing errors when individual elements exceed 2GB, which exceeds protobuf limits.

Issue Priority

Priority: 2 (default / most feature requests should be filed as P2)

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