Add Patreon Auth

[ghostdevv]

I based this off the Yandex commit 435eca6#diff-0c7bbc200a025d45ef4358425b0a3c41b8de1e8b9d5f4b94a09f1d5c612e4481 - let me know if there is anything missing and I will add it to this pr! I tested this auth with the pocketbase js sdk and also running make test and make lint

[ghostdevv]

Submitted a PR to the oauth2 package to add the patreon endpoints golang/oauth2#668

[ghostdevv]

Just thought of something - it might be worth mentioning somewhere that it requires Patreon api v2 keys to be given

[ganigeorgiev]

Thank you! I've tested the implementation locally, with both creator and regular user/subscriber, and everything seems to work fine.

To avoid the back-and-forth, I've squash merged it directly in the develop branch (71f9be3) (I've added only v2 to the provider title).

If the Go team ended up merging the endpoints PR we can update it later, but even with the static endpoints is fine (at the end the userApiUrl will still be "hardcoded").

The change will be available with the next PocketBase v0.19.0 release, but please note that there are no fixed ETAs yet (see also #3271). If you want to generate a static binary from the develop branch similar to the releases prebuilt executables, you can:

1. Checkout or clone the develop branch

   git clone https://github.com/pocketbase/pocketbase.git --branch develop --single-branch

2. Navigate to examples/base
3. Run GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build (https://go.dev/doc/install/source#environment)
4. Start the created executable by running ./base serve.

[ghostdevv]

Ty!