Should add `type` to type-only export by default

related to #678

type-only export also needs `type` keyword. Current output from telescope mixes normal import/export and type-only import/export.

This is not compatible with `verbatimModuleSyntax`, which helps bundlers to drop type-only import/export while transpiling.

tsc (or tsc-based tools ex. tshy, zshy) would not have any problem with mixing import/export since tsc has type info while walking AST but the modern bundlers (esbuild, Oxc, ...) don't. They run tsc only as a type checker, then strip type for transpiling, leaving type-only import/export on run-time js source.