parabar v1.2.0

What's Changed

• Miscellaneous documentation fixes by @mihaiconstantin in #54
• Miscellaneous code changes by @mihaiconstantin in #55
• Update GitHub workflows by @mihaiconstantin in #56
• Release 1.2.0 by @mihaiconstantin in #57

Changed

• Enable roxygen checks for R6 documentation in DESCRIPTION.
• Update Context to implement the Service interface.
• Update GitHub workflows.
• Fix typos and other errors in code documentation.

Full Changelog: v1.1.1...v1.2.0