KAFKA-12376: Apply atomic append to the log

[jsancio]

Append to the log in one batch when handling:

1. Client quota changes
2. Configuration changes
3. Feature changes
4. Topic creation

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[mumrah]

Thanks for the patch @jsancio! Looks like the RaftClient already had the atomic batch method, so it looks like we're just exposing that up to the controller "manager" classes?

[mumrah]

Left one non-trivial comment. After that and @tombentley's comments I think this LGTM

[jsancio]

Thanks for the review @mumrah @tombentley