shovel-config-ts: TS package for building shovel config

[ryandotsmith]

This is a v0 idea. Just the basics. We can iterate and find more creature comforts as we go along.

[ryandotsmith]

Another idea from @malonehedges

function makeIntegration<T something goes here>(
  event: SomeAbiTypeHere, 
  table: SomeTableType, 
  eventMappings: Array<{ integrate subset of abi and table types here }>,
  otherFeatures...
): Integration