fix: add experimental-loader for Yarn PnP

[lachlanhunt]

Adding the experimental-loader for PnP to resolve the remaining issue with loading mjs workers within synckit.

I currently don't have a test case within this repo's test suite that can demonstrate this because the difficulty is that this repo itself it not actually using Yarn PnP, and doesn't have dependencies stored within zip files. I don't yet know if writing a test case for it in this test suite is possible.

At this stage, I can only confirm that the test script I commented about in the other PR only succeeds when run within a repo using PnP and with a patched version of synckit that includes this change.

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📊 Package size report   No changes

File	Before	After
Total (Includes all files)	44.2 kB	44.2 kB
Tarball size	12.1 kB	12.1 kB

Unchanged files

File	Size
lib/index.cjs	9.5 kB
lib/index.d.ts	1.3 kB
lib/index.js	10.7 kB
lib/index.js.map	9.0 kB
lib/types.d.ts	936 B
lib/types.js	44 B
lib/types.js.map	102 B
LICENSE	1.1 kB
package.json	4.0 kB
README.md	7.6 kB

_{🤖 This report was automatically generated by pkg-size-action}

[JounQin]

@lachlanhunt Thanks for your contribution first! But I'm sorry it has been fixed by #103.

[JounQin]

Besides, we do have test case for yarn PnP at https://github.com/un-ts/synckit/blob/main/test/fixtures/yarn-pnp.spec.ts