[Rewards] Fixed collectRewardsTx cross-chain request/response handling #110
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Why this should be merged
Before this PR, cross-chain request were sent without handling response, which resulted in error messages, cause of unexpected timeout failure response, since pvm weren't sending any response as well.
This PR and chain4travel/caminogo#369 fixes that.
How this works
vm.SendCrossChainRequest
method which properly utilized handlers and controls response "expectations".How this was tested
Manually.
Additional references
Original PR based on cortina-15 dev
#102