[Feature]: bundle declarationMap

[ImSingee]

What problem does this feature solve?

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

It's crucial for using rslib in monorepo that nearly all IDE (VS Code, JetBrains, etc.) relies on this to provide a correct "jump to definition" feature

What does the proposed API look like?

I think it's enough that just add a declarationMap: true option to output config.

[Timeless0911]

Type-related configurations are all gathered in tsconfig.json, you can configure directly in tsconfig.json.

We don't plan to make this a default option since we want users choose whether to enable it.

[fi3ework]

• In unbundle mode, you could set compilerOptions.declarationMap to true to emit the map, Rslib will do nothing here.
• In bundle mode, we use api-extractor to bundle the d.ts files, tracked in [api-extractor] Declaration map rollup microsoft/rushstack#1886.