Add support for localDisposableOnly and localFreeOnly configuration

This is fantastic, thank you, great work. I've marked just one nitpick but otherwise this is ready to ship. I'm happy to make the change myself and commit but I ran out of time this morning.

Oh I forgot about tests, it would be really great if this had a test.

The test has uncovered the fact that the provider results get statically cached in each request. If we change the configuration part way through (say if we're validating a different field that has a different set of overrides) we're going to run into issues. We'll need to get that sorted out before we can commit this.

I'll raise a PR on the external library if I can figure out how to make it work. Postponing on that.

Ah there's already an issue raised and the maintainer self-assigned yesterday, good timing :)

https://github.com/stymiee/email-validator/issues/5

https://github.com/stymiee/email-validator/releases/tag/1.1.4 just came out which should unstick this, running the tests again now.

Tests passed. Think we'd better bump the minimum version of the library since that's required to solve this bug.

Thanks so much for your work on this @k-l :)

Automatically closed - issue fixed for 2 weeks with no activity.