src: simplify NativeModule caching and remove redundant data

- Remove `NativeModule._source` - the compilation is now entirely
  done in C++ and `process.binding('natives')` is implemented
  directly in the binding loader so there is no need to store
  additional source code strings.
- Instead of using an object as `NativeModule._cached` and insert
  into it after compilation of each native module, simply prebuild
  a JS map filled with all the native modules and infer the
  state of compilation through `mod.loading`/`mod.loaded`.
- Rename `NativeModule.nonInternalExists` to
  `NativeModule.canBeRequiredByUsers` and precompute that
  property for all the native modules during bootstrap instead
  of branching in every require call during runtime. This also fixes
  the bug where `worker_threads` can be made available with
  `--expose-internals`.
- Rename `NativeModule.requireForDeps` to
  `NativeModule.requireWithFallbackInDeps`.
- Add a test to make sure we do not accidentally leak any module
  to the global namespace.

PR-URL: https://github.com/nodejs/node/pull/25352
Reviewed-By: Anna Henningsen <anna@addaleax.net>

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