ADD: /thorchain/block/:height API with decoded block and results

Nine Realms put up a convenience API awhile ago as an example that decodes block transactions, to illustrate the data contained in the block: https://api.ninerealms.com/thorchain/block/txs/12000002. Explorers have asked to use this so they do not have to deal with protobuf themselves, but we do not want any ecosystem components dependent on something proprietary - we should add an endpoint with a super set of this data that should allow anyone to fetch the entire decoded data for the block:

{
    "height": ...,             # from block_results
    "hash": ...,               # from block
    "header": ...,             # from block
    "begin_block_events": ..., # from block_results
    "end_block_events": ...,   # from block_results
    "txs": ...,                # from block - except we decode and send the JSON 
    "txs_results": ...,        # from block_results
}

Internally this just makes an RPC for the block and block_result and formats the response in a convenient way to ingest.

EDIT: This was modified slightly to just embed the result in the tx and pass the id struct instead of height/hash independently.