crosscluster/logical: validate UDT equivalency in LDR planning

[msbutler]

When #131130 merges, we will support replication of a table with a UDT if the user in is in yolo mode, i.e. with the SKIP SCHEMA CHECK option. To allow UDT support in general, we need to validate UDT equivalency during LDR planning via the CheckLogicalReplicationCompatibility function, here.

With #131130, the source types will be plumbed to the streampb.ReplicationProducerSpec here.

At first, we should check physical udt equivalency, i.e. color: blue=1, green =2 does not equal color: green=1, blue =2 for now.

Jira issue: CRDB-42861

Epic CRDB-41465

[blathers-crl]

Hi @benbardin, please add branch-* labels to identify which branch(es) this GA-blocker affects.

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