Feat: Add ability to parse single quote imports

[kliao]

Description

Import paths can be single-quoted, so add the ability to parse such imports instead of only allowing double-quoted imports.

Testing instructions

Added unit test.

Types of changes

Checklist:

• [x] Prefix PR title with [WIP] if necessary.
• [x] Add tests to cover changes as needed.
• [ ] Update documentation as needed.
• [ ] Add new entries to the relevant CHANGELOG.jsons.