🐛 Bug Report — Runtime APIs: No privileged mode option for Containers local development

## Issue

Following [this documentation](https://developers.cloudflare.com/containers/examples/r2-fuse-mount/) regarding using FUSE as FS with R2 in Cloudflare Containers, i encountered the following bug:

- https://github.com/cloudflare/containers/issues/112#issuecomment-3590004554

I figured out, there is no option for the end user to enable/ask workerd to run Docker in privileged mode for local testing which hinders local testing of containers for certain applications. (Eg: FUSE support/modprobe)

## Proposed Solution

- Expose `runPrevileged` option and append it:
https://github.com/cloudflare/workerd/blob/4d3bfd7df2bca147b2e98538f874f89c0ec13c02/src/workerd/server/container-client.c%2B%2B#L287
if enabled, the docker api capnp already has the specs
https://github.com/cloudflare/workerd/blob/4d3bfd7df2bca147b2e98538f874f89c0ec13c02/src/workerd/server/docker-api.capnp#L145

- Generate Capnp and allow Miniflare to access this for local-development
- Miniflare exposes this as a config to wrangler
- User can set a wrangler config either via config file or via CLI params `wrangler dev --previleged`

Would like to know your thoughts on this, and would love to contribute regarding the same!

cc: @anonrig