Add INIT_WAIT_TIME CQL option to sleep after table creation

[li-boxuan]

Amazon Keyspace creates keyspace and tables asynchronously. As such, users have to retry graph creation multiple times until they don't see errors like unconfigured table janusgraph.system_properties. To address this problem, this commit adds a config option, storage.cql.init-wait-time, that does a blocking wait after each table creation request. Changes have been manually tested against Amazon Keyspace.

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[porunov]

LGTM. Thank you @li-boxuan !

[cdegroc]

LGTM too

[li-boxuan]

Not sure why CodeCov is complaining about the coverage, but my debugger shows the new code is indeed covered by the new test

[janusgraph-automations]

💚 All backports created successfully

Status	Branch	Result
✅	v1.0

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