[Server] Make Graceful shutdown properties configurable

[polyzos]

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• I searched in the issues and found nothing similar.

Description

Fluss supports graceful shutdown, however the properties used are hardcoded into the TabletServer

private static final int CONTROLLED_SHUTDOWN_MAX_RETRIES = 3;
private static final long CONTROLLED_SHUTDOWN_RETRY_INTERVAL_MS = 1000L;

see here

We can make these configurable.

Willingness to contribute

• I'm willing to submit a PR!

[hemanthsavasere]

Hi @polyzos
Can I start working on this

[polyzos]

sure @hemanthsavasere assigned to you

[hemanthsavasere]

@polyzos and @MehulBatra I have completed my work and tested the code changes in the PR. Can you please review the same

PR Link : #1830