[master < T891] (UN)LOCK query enhancement

[andrejtonev]

[master < Task] PR

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docs PR #881
resolves #891

[andrejtonev]

Pushed the new API.
I also updated the tests and replication client to handle the new API.

[antoniofilipovic]

Looks good now! Great effort on first-ever PR on Memgraph 🥳 Check one more comment that is left, and if you think it is resolved, just ping me on Slack so I can 🚢 🇮🇹