[ISSUE #63] Support rich initialization modes of RocketMQSource & Fix some bugs

[deemogsw]

Support rich initialization modes of RocketMQSource Fix some bugs

[deemogsw]

• [bug]PartitionDiscoveryIntervalMs can't set to negative
• [bug]Idle source task can't be released automatic
• [bug]Offset didn't commit to broker in RockerMQSource in phase of checkpoint
• [bug]Records can't arrive to sink() in UNBOUNDESS mode
• [features]Commit offset immediately when checkpoint is disable
• [features]Support rich initialization modes
• [features]Metrics with new source
• [features]Boost for flink-sql-connector

[deemogsw]

As description in issue #69 ,branch of master has some bugs with pr #46 .So my branch still be dependent on common pull mode.
I will complete the README.md with usage of sql-connector later.
@lizhimins @SteNicholas Can you help me review the code?

[GOODBOY008]

@deemogsw Thanks for your contributions! Can you rebase to last main branch.

[deemogsw]

@deemogsw Thanks for your contributions! Can you rebase to last main branch.

Main branch has bug in litepull consumer.I have mentioned in issue #69 .You can also have a try by running the latest cade

[SteNicholas]

@deemogsw, could you please resolve the conflicts firstly?