fix!: Cache should take key to be properly cleared

[spydon]

Description

The cache was not being cleared properly since it wasn't the correct type for the key passed in to clear and it was mapping values instead of keys in clearAll.

Checklist

• The title of my PR starts with a Conventional Commit prefix (fix:, feat:, docs:, chore: etc).
• I have read the Contributor Guide and followed the process outlined for submitting PRs.
• I have updated/added tests for ALL new/updated/fixed functionality.
• I have updated/added relevant documentation and added dartdoc comments with ///, where necessary.
• I have updated/added relevant examples in example.

Breaking Change

• Yes, this is a breaking change.
• No, this is not a breaking change.

Migration instructions

Pass in the name of the path as a string to clear instead of a Uri.

Related Issues

Closes #1346