⭐️ Support events not defined in a contract

[pawelpolak2]

closes #594

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: f862503585e3b5888ce4c5e25f290d91f7f3b9db

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

| Name | Type | | ------------------------------ | ----- | | @ethereum-waffle/mock-contract | Patch | | @ethereum-waffle/chai | Patch | | ethereum-waffle | Patch |

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[yivlad]

Also changest