[input-output-hk/cardano-sl] [CHW-37] API v1 endpoints (external variants) (#2702)

@denisshevchenko pushed 3 commits.

e641102 add createUnsignedTransaction
0d1d016 reducing duplicate code
81218b4 Merge pull request #2853 from input-output-hk/costasvr/CHW-84

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