kvclient: introduce txnWriteBuffer interceptor #139742
Merged
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This patch introduces a new txn interceptor to the TxnCoordSender's interceptor stack -- the txnWriteBuffer. This commit is mostly boilerplate code with some forward looking commentary, so for now, the interceptor is as no-op as it gets. Soon, we'll expand this to actually introduce client side write buffering.
References #139053
Release note: None