V5 port of this plugin (with other updates)

[benjie]

• Integrates:
  • Compatibility with postgraphile-plugin-connection-filter 2.0.0 #11
  • upgrade tsquery #13
• Upgrades some modules
• Prettifies the tests (and alphabetically sorts the schema for easier cross-version comparison)
• Fixes bug in test suite where same name is used twice
• Converts to TypeScript.
• Adds compatibility with the very latest PostGraphile V5 beta

I've released a scoped version of this plugin under @graphile-contrib/postgraphile-plugin-fulltext-filter@2.0.0-beta.1 for now.

This is just an experimental version to see what's possible; I had to do some hacks to make it work because we shouldn't be modifying the result nodes (that's not compatible with normalized store assumptions) - I'd be interested in exploring what it would be like adding these values to the edges instead as that would be safe to do with normalized stores.

Thanks for creating this plugin! Let me know if/how you'd like to proceed :)