Add protobuf support for lambdas#22362
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This was referenced May 19, 2026
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Which issue does this PR close?
Part of #21172
Rationale for this change
Protobuf support wasn't implemented in main lambda PR to not make it even bigger
What changes are included in this PR?
Protobuf encoding and decoding (~1000 LOC in generated files, ~210 impl, ~400 tests)
Are these changes tested?
Unit tests, similar to the existing ones for scalar functions
Are there any user-facing changes?
None