Add off-chain-data go client application #1269

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	Sha	Message	Pass or fail reason
🟢	a012f78	Add off-chain-data go client application	`Valid sign-off found`
🟢	3caadda	Add endorser tx unwrapping test	`Valid sign-off found`
🟢	6ac8bed	Implement payload interface	`Valid sign-off found`
🟢	c6651f0	Implement Transaction interface	`Valid sign-off found`
🟢	d566a86	Encapsulate block parser in a package	`Valid sign-off found`
🟢	3df357d	Implement block parsing	`Valid sign-off found`
🟢	d4071cb	Implement block and transaction processor	`Valid sign-off found`
🟢	df52240	Implement store	`Valid sign-off found`
🟢	407a942	Implement caching	`Valid sign-off found`
🟢	3a70427	Extract block processor and store from listener	`Valid sign-off found`
🟢	77fad6f	Implement graceful shutdown of listen function	`Valid sign-off found`
🟢	dfcc123	Refactor parser package, decompose files	`Valid sign-off found`
🟢	41e0544	Execute transactions in go routines concurrently	`Valid sign-off found`
🟢	ed3737d	Fix simulated failure issue	`Valid sign-off found`
🟢	f9285d5	Replace panic with error handling	`Valid sign-off found`
🟢	69c521f	Update README and ci	`Valid sign-off found`
🟢	d6ad358	Add first batch of pull request rework	`Valid sign-off found`