Add WithInit() to support chaincodes that require init

[jimthematrix]

Even though the latest recommendation from the Fabric team is to step away from requiring init, a lot of customers still use this approach, and the official docs for Fabric chaincode lifecycle still describes the --init-required parameter, finally the fabric-samples that is used widely by tire-kickers still implements InitLedger().

Added a new SubmitInit() instead of modifying the existing signature to allow backward compatibility

[codecov]

Codecov Report

Merging #236 (1c704ae) into main (7a94fbc) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #236   +/-   ##
=======================================
  Coverage   76.21%   76.22%           
=======================================
  Files         193      193           
  Lines       14098    14103    +5     
=======================================
+ Hits        10745    10750    +5     
  Misses       2385     2385           
  Partials      968      968           

Impacted Files	Coverage Δ
pkg/gateway/transaction.go	88.39% <100.00%> (+0.54%)	⬆️

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[troyronda]

@andrew-coleman Do you have any comments about the additional function in the Gateway package?

[bestbeforetoday]

There are already TransactionOption functional options to set endorsing peers and transient data when calling CreateTransaction(). I think this would be a better fit for creating a Transaction with the isInit flag set. Something like:

func WithInit() TransactionOption {
	return func(txn *Transaction) error {
		txn.isInit = true
		return nil
	}
}

[andrew-coleman]

Hi Jim, if we were to implement this in the new fabric-gateway Go API, we would almost certainly adopt the pattern as suggested by Mark in the previous comment. Would you be able to do that here?

[jimthematrix]

@bestbeforetoday @andrew-coleman thanks for suggesting the options approach, I can switch to that in this PR.

[andrew-coleman]

Thanks Jim!