Support Typescript Route files #17
Description
should mostly just involve looking for .rt.ts files in addition to .rt.cjs and .rt.mjs files here: https://github.com/SRFNStack/spliffy/blob/master/src/routes.mjs#L31
Once that's done, dynamically loading the route files should still work when running with ts-node, at least, that's the theory.
Once that's done, it should be functional.
After it's functional, we should revisit how routes are loaded and come up with type definitions for spliffy users to build with.