feat: ruxpy tree implementation for directory structure

[tanmayc07]

Key Changes

• Implemented tree objects for storing project directory state.
• Integrated the tree objects in the starlog objects so that the directory state is synced everytime one records a new starlog entry.
• Added a new command warp to change courses/branches which adds one more step towards branching logic.
• Added checks to ensure no loss of state before warping to new course.
• Updates documentation to include the new additions and their usage.