Tell Bugsnag what version of Blossom is running

[TheLonelyGhost]

Description:

By reading from the pyproject.toml, we can tell the version string. Even if it doesn't exist, it fails gracefully with a version string of unknown.

Given our deployment strategy preserves pyproject.toml next to the source code, this should be an okay assumption to make.

Checklist:

• [x] Code Quality
• [x] Pep-8
• [x] Tests (if applicable)
• [x] Success Criteria Met
• [x] Inline Documentation
• [x] Wiki Documentation (if applicable)