Fixes #24740.
Implements the `uv_mutex_*` and `uv_async_*` APIs.
The mutex API is implemented exactly as libuv, a thin wrapper over the
OS's native mutex.
The async API is implemented in terms of napi_async_work. As documented
in the napi docs, you really shouldn't call `napi_queue_async_work`
multiple times (it is documented as undefined behavior). However, our
implementation doesn't have any issue with this, so I believe it suits
our purpose here.
- add fallback impls of external string apis which always copy. after
upstream changes to rusty_v8 we can support non-copying api as well.
- `napi_get_buffer_data` needs to work on all TypedArray instances.
- Fixes: https://github.com/denoland/deno/issues/24209
- `target_defaults.default_configuration` is used by some modules to
find the corresponding node file from node-gyp
- `node_api_get_module_filename` expects the filename to be a `file:`
url.
