authz/ics20: add e2e tests

[crodriguezvega]

• One happy path where the granter can grant privileges to the grantee and the grantee succeeds on transferring tokens to the recipient.
• One unhappy path where the grantee does not have privileges and the attempt to transfer tokens fails.

Open PRs against the feature branch.

[chatton]

One thing to keep in mind is that we run all our E2E tests against main, so the E2E test itself can be on main, but the images used need to be built from the feature branch.

However if we need to use ibc-go types from the feature branch, then opening a PR against the feature branch might be the best option.

EDIT: we will need types from the fork, let's add the test to the fork as originally suggested!