fix: Don't import from typescript source files (#125)

Importing from typescript source files distributed with a module causes user projects to type check those source files using the tsconfig of the user project rather than that of the module, with stricter settings raising errors that would otherwise go unnoticed.

See microsoft/TypeScript#40426

index.ts

@@ -1,4 +1,4 @@
-import { TemplateCompileOptions } from '@vue/component-compiler-utils/lib/compileTemplate'
+import { TemplateCompileOptions } from '@vue/component-compiler-utils'
 import { normalizeComponentCode } from './utils/componentNormalizer'
 import { vueHotReloadCode } from './utils/vueHotReload'
 import fs from 'fs'