Separate subgraph from utils

[pi0neerpat]

Created a separate package for @rtoken/subgraph rather than in @rtoken/utils. Updated the subgraph to the latest, and simplifed the flow for setting it up.

Changes made to @rtoken/contracts are to

• add --fx to lint command
• add a test to deploy the contracts and run a few cycles, so I can test the subgraph. It is essentially a copy of the main rToken test that I will be updating in the future. It is not included in the main test commands for the contracts.
• Updated the package.json to reflect the namechange from rtoken-contracts to rtoken-monorepo

[pi0neerpat]

Ive already started that in another branch! One thing at a time ;)