feat(core-manager): implement snapshots.create
action
#3728
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Summary
This PR add new action which creates snapshot with given parameters. PR also implements snapshot-manager which prevents snapshot action to run in parallel and can be later extended to keep record of the process status (eg: percentage of restored blocks).
Action
Name: snapshots.create
Params:
Response:: Empty response if snapshot process is started successfully. It doesn't guarantee that snapshot process completed successfully.
(*) Block height is later re-calculated to match nearest round start.
Checklist