Add Support to Typescript V7

tsup's DTS generation (via rollup-plugin-dts) crashes when using TypeScript 7.0.x. This appears to be caused by TypeScript 7.0 shipping without a stable programmatic/compiler API (the API is expected to land in 7.1 — see Microsoft's TS 7.0 announcement).

Reproduction

Minimal setup:

• typescript: 7.0.2
• tsup: 8.5.1
• Config with dts: true (or default entry that triggers dts generation)

Run:

tsup