Add rpc call test suite for simple testing

[Nana-EC]

Problem

Currently most endpoint testing is done manually through curl or metamask.
We need a quick way to run a collection of calls against a hosted instance - local or deployed

Solution

Utilize postman (newman CLI) flow to run multiple queries against a hosted relay instance.

• Add transaction submission logic using js-sdk

See Mirror Node Web3 acceptance test as inspiration.

For a postman.json file see the Mirror Node web3 postman.json for inspiration.

Alternatives

Add a ts test suite with a CLI option to run