Add skeleton of other nosql plugin and add dynamodb package

[longquanzheng]

What changed?

1. Add skeleton of dynamodb plugin
2. Add NoSQL configure struct

Why?

1. For dynamodb implementation
2. For showing open source community of how to add a mongodb plugin

How did you test it?
existing test

Potential risks
No

Release notes
No

Documentation Changes
No

[coveralls]

Pull Request Test Coverage Report for Build 30f026d0-6f01-4089-903b-f48be133c590

• 7 of 22 (31.82%) changed or added relevant lines in 3 files are covered.
• 16 unchanged lines in 6 files lost coverage.
• Overall coverage increased (+0.003%) to 59.799%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
common/persistence/client/factory.go	6	10	60.0%
common/config/persistence.go	0	11	0.0%

Files with Coverage Reduction	New Missed Lines	%
common/task/weightedRoundRobinTaskScheduler.go	1	88.6%
common/task/fifoTaskScheduler.go	2	85.57%
service/history/execution/mutable_state_builder.go	2	69.82%
service/matching/taskListManager.go	2	74.72%
common/cache/lru.go	3	90.73%
service/history/execution/context.go	6	68.39%

Totals
Change from base Build b15629f5-4249-4bb9-866b-19083dcdf7ea:	0.003%
Covered Lines:	88509
Relevant Lines:	148011

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💛 - Coveralls