TODOs in 2.2 Release

[envestcc]

PR Review

The following PRs that need review have been grouped by functionality. Each group can be reviewed simultaneously, but it's best to review them in order within each group.

Chained workingset:

• fix buffer write batch dead lock #4577
• Delete dock and fix potential corruption state issue #4581

Prepare Proposal:

• [refactor] Deprecat blockTimeCalculator #4592
• [refactor] move getBlockTime and getBlockHash funcs into blockchain context #4590
• Forked ChainManager #4593
• Prepare next proposal #4594

Consensus params:

• [consensus] reduce block interval to 3s #4571

System Staking & Rewarding:

• mute system contract staking index #4588
• Timestamped Staking Contact Indexer #4589
• [rewarding] update block reward at wake height #4595