Add logging for crashes in commit_compaction_data

[iilyak]

Crash in commit_compaction_data causes severe issues. However it is quite hard to figure out what shard it was crashed on. We need to add logging to log shard name in case of a crash in the critical function.

Expected Behavior

When commit_compaction_data crashes for any reason we should see a message in the log which contains the shard name.

Current Behavior

There is a crash dump which doesn't contain any useful information to identify problematic shard.

Possible Solution

Add try/catch and log from the catch

Steps to Reproduce (for bugs)

See https://github.com/apache/couchdb/pull/1255/files#diff-b6c880ef1513b1db939914f94786a1a5

Context

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