feat: emit metadata in _afterTokenTransfer hook

[andreivladbrg]

Closes #670

[PaulRBerg]

Generally LGTM but we also need to write a test that shows that the metadata event gets emitted on transferFrom.

[andreivladbrg]

but we also need to write a test that shows that the metadata event gets emitted on transferFrom.

We should add for both before and after hooks tests, then.

[PaulRBerg]

We should add for both before and after hooks tests

Yes.

[andreivladbrg]

@PaulRBerg pushed 2 more commits. Lmk if there is anything left

[PaulRBerg]

LGTM, let's wait for the CI to finish and then you can squash and merge, @andreivladbrg.