Add Origin Private File System (OPFS) API Support

[okikio]

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Describe the feature

OPFS is a new API for storing files using the browser it would cover custom file usecases and enable a less memory intensive file system storage system on the web

Additional information

• [ ] Would you be willing to help implement this feature?

[loilo]

I just made an OPFS driver (roughly based on the fs-lite driver). It needs some more polishing, but I'm going to create a PR some time this week.