create hs-abci-test-utils package

[martyall]

• [x] factor out all the duplication from nameservice and simple storage utils for managing signing, utils, and expected tx results
• [x] move the client generator from SDK into here, and remove the sdk depenency on the tendermint-client-lib
• [x] move the FromEvent class from the Events module into here, since again there's no reason the SDK needs to decode events

[IvantheTricourne]

move the FromEvent class from the Events module into here, since again there's no reason the SDK needs to decode events

should we move this test to the test utils test then? https://github.com/f-o-a-m/hs-abci/blob/master/hs-abci-sdk/test/Tendermint/SDK/Test/EventSpec.hs#L17

[martyall]

hmm, i guess so