Add transaction_hash query to module-transactions

[iamacook]

Summary

For role-based execution on the Web, it is necessary to query for module transactions via transaction hash. This is possible directly via the Transaction Service as the module-transactions endpoint accepts the transaction_hash query. However, we do not expose this on the Gateway.

As such, this add and forwards a transaction_hash query to the module-transactions endpoint.

Note: the clients also split the txId to fetch the moduleId of the transaction in question. We should ideally return this within the Transaction entity so that they need not reference our constructed ID. This would be better tackled in #1613, however.

Changes

• Add transaction_hash query to module-transactions endpoint and propagate it to Transaction Service
• Add txHash value to field of module transaction cache
• Update tests accordingly

[coveralls]

Pull Request Test Coverage Report for Build 9446277873

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.03%) to 92.731%

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Totals
Change from base Build 9444680700:	0.03%
Covered Lines:	7127
Relevant Lines:	7385

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💛 - Coveralls