A tool outputs the JSON file that enables autogen

[mishmosh]

• CLI tool that you run against the lotus directory
• Runs a go module using go reflection
• Outputs a JSON file

Not in scope:

• Ability to switch branches, etc.

[jimpick]

Oops, I forgot this one was here. Wrote it up a second time as #2. Transferring it over here:

The command line tool should do the following:

1. Take in the directory with the Lotus source code as an argument
2. Generate a temp directory
3. Generate a go.mod file with a replace directive pointing to Lotus
4. Build/execute a go program in the temp directory that links to the Lotus libraries and uses go reflect to catalog the JSON-RPC methods, outputting a schema JSON file.

This tool should live outside the js-lotus-client-schema repo, but the generated outputs will be checked in here.