Document webpack change: new Worker() support

[webpack-bot]

A pull request by @sokra was merged and maintainers requested a documentation change.

See pull request: webpack/webpack#11439

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• add support for async anonymous entrypoints from inside the codebase
• add worker example
• move entry options into Entrypoint and receive them from there

This adds support to create entrypoints from AsyncDependenciesBlocks. Might also be useful for other scenarios (@timneutkens interactive)

What kind of change does this PR introduce?
feature

Did you add tests for your changes?
yes

Does this PR introduce a breaking change?
yes

What needs to be documented once your changes are merged?

• new option ouput.workerChunkLoading controls the chunk loading of workers (default chosen based on output.chunkLoading)
• some syntax triggers webpack to compile "..." as new entrypoint with ouput.workerChunkLoading as chunk loading mechnism
  • new Worker(new URL("...", import.meta.url), ...) with optional import { Worker } from "worker_threads"
  • navigator.serviceWorker.register(new URL("...", import.meta.url), ...)

[QC-L]

Would love to work on this.