Add `--dts-resolve` flag like tsup

[hyoban]

When I patch some dependencies locally, I will move them to dev dependencies and bundle them, but the type will not be bundled. It would be great to have a --dts-resolve flag like tsup.

• https://tsup.egoist.dev/#generate-declaration-file
• https://github.com/egoist/tsup/blob/dev/src/rollup/ts-resolve.ts

[SukkaW]

We need to pass respectExternal to rollup-plugin-dts for this to work.