feat(node-api): create a node.js wrapper library for the JSON-RPC workspace protocol

[leops]

Summary

This PR creates a new @rometools/backend-jsonrpc library that implements the Workspace API by wrapping the JSON-RPC protocol exposed by the daemon server. The library is split into a few modules that may be imported independently:

• command resolves a file system path to the Rome binary
• socket ensures the daemon process is spawned and opens a node.js Socket connection to the RPC channel
• transport wraps an open socket and implements the JSON-RPC protocol as untyped method calls and responses
• workspace is automatically generated from the JSON schema of the Workspace API, and wraps a Transport instance with an object implementing typed methods calls to the remote workspace

At the top level of the library a single createWorkspace method calls each of these in sequence, wrapping each layer with the next one and returning a Workspace object ready to use

Test Plan

I added a small test script that creates creates a workspace instance (using a local build of the binary from the Cargo target directory), executes a few method calls then shuts down

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Parser conformance results on ubuntu-latest

js/262

Test result	main count	This PR count	Difference
Total	45878	45878	0
Passed	44938	44938	0
Failed	940	940	0
Panics	0	0	0
Coverage	97.95%	97.95%	0.00%

jsx/babel

Test result	main count	This PR count	Difference
Total	39	39	0
Passed	36	36	0
Failed	3	3	0
Panics	0	0	0
Coverage	92.31%	92.31%	0.00%

symbols/microsoft

Test result	main count	This PR count	Difference
Total	5946	5946	0
Passed	396	396	0
Failed	5550	5550	0
Panics	0	0	0
Coverage	6.66%	6.66%	0.00%

ts/babel

Test result	main count	This PR count	Difference
Total	588	588	0
Passed	519	519	0
Failed	69	69	0
Panics	0	0	0
Coverage	88.27%	88.27%	0.00%

ts/microsoft

Test result	main count	This PR count	Difference
Total	16257	16257	0
Passed	12397	12397	0
Failed	3860	3860	0
Panics	0	0	0
Coverage	76.26%	76.26%	0.00%

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Playground for commit 7f2ecf5