puterjs/fs: add "share" arg to fs.write api, add test as well

[XiaochenCui]

fix #1406

How to use

            let result = await puter.fs.write('~/test.txt', 'hello', {
                share: {
                    recipients: ['tom', 'jerry'],
                    access: 'read',
                },
                withPermissions: true,
            });

NB

• This PR relies on the new api-test from fs/memoryfs branch, and thus shouldn't be merged before fs/memory-provider #1400

[KernelDeimos]

We can merge this sooner than memoryfs if you can base it on main

[XiaochenCui]

We can merge this sooner than memoryfs if you can base it on main

now it's based on main

[XiaochenCui]

TODO: Create more refined tests, for example, verifying access to the shared file as the recipient.