GH-45203: [C++][Acero] TeeNode metadata #45211
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Rationale for this change
Explained in #45203
What changes are included in this PR?
This PR introduces the ValidateAndPrepareSchema function, which validates the metadata and assigns the custom_schema. The implementation is extracted from the MakeWriteNode function.
Are these changes tested?
Yes, the changes are tested using the existing tests for WriteNode from the write_node_test.cc file, and analogous tests have been created for TeeNode.