Validate config file options (ConfigOptions)

[neuronull]

Summary

Fixes: #1924

Adds additional validations to ConfigOptions by means of the yup API.

Testing Plan

Added unit tests for configuration schema validations, and applying the default config against the schema.

Breaking Change

No

Graffiti

null

[hughy]

Thanks for picking up this task!

I left one small suggestion

[hughy]

Looks good, just need to fix lint issues.

You can run yarn lint:fix to fix automatically where possible.

[neuronull]

Looks good, just need to fix lint issues.

You can run yarn lint:fix to fix automatically where possible.

Ah, good to know. I'm quite new to TS. I think this means I solved them?

$ yarn lint 
yarn run v1.22.19
$ tsc -b && tsc -b tsconfig.test.json && eslint --ext .ts,.tsx,.js,.jsx src/
Done in 60.07s.

[hughy]

Great! Thanks again!