Enable verbatimModuleSyntax (during checks) for explicit import/export types

https://www.typescriptlang.org/tsconfig/#verbatimModuleSyntax

Only enabling this for type checks right now, so that src can stay clean.
Disabling at build/runtime because there's a weird interaction with extensionless
that fails to omit type import when doing a path rewrite.
Also ts-jest does not support this yet either.
Future could change this chain without affecting src code.

Author: CarsonF

tsconfig.check.json

@@ -2,6 +2,7 @@
   "extends": "./tsconfig.json",
   "compilerOptions": {
     "noEmit": true,
+    "verbatimModuleSyntax": true,
     "incremental": false
   }
 }