feat(type,type-compiler): inline external library imports

[marcus-sa]

Summary of changes

Supersedes #517

This introduces a new entry for the type compiler options in tsconfig.json.

{
  "deepkitTypeCompilerOptions": {
    "inlineExternalLibraryImports": {
      "rxjs": true, // mark all imports to be inlined
      // or
      "rxjs": ["Observable", "Subject"] // mark selected imports to be inlined
    }
  }
}

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