feat(rosettarpc): Data API implementation (#2940)

Resolves #2738 

The spec is: https://raw.githubusercontent.com/coinbase/rosetta-specifications/master/api.json (you can view it on https://petstore.swagger.io/)

[README](https://github.com/nearprotocol/nearcore/blob/feature/rosetta-api/chain/rosetta-rpc/README.md)

This implementation is battle-tested and checked by Coinbase using automated tooling (rosetta-cli)

CODEOWNERS

@@ -3,7 +3,7 @@
 /chain/ @SkidanovAlex @bowenwang1996
 /chain/jsonrpc/ @frol @evgenykuzyakov
 /chain/indexer/ @khorolets @frol
-/chain/rosettarpc/ @frol
+/chain/rosetta-rpc/ @frol
 
 /runtime/ @evgenykuzyakov @chain-police
 /runtime/runtime-params-estimator/ @olonho @willemneal