feat(meta-service): add FetchAddU64 command to txn - #18243
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`FetchAddU64` fetch the `u64` value of a key and add provided delta to it, in one RPC. The response `FetchAddU64Response` returns the key, the value before update and the value after update.
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Summary
feat(meta-service): add FetchAddU64 command to txn
FetchAddU64fetch theu64value of a key and add provided delta toit, in one RPC.
The response
FetchAddU64Responsereturns the key, the value beforeupdate and the value after update.
Tests
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