Basic GitGraph visualization

[nelsonni]

Description:

Adds a new GItGraph React component that generates a Directed Acyclic Graph (DAG) representing all of the branches (both local and remote) for a specific git repository.

This PR resolves #[XXXX], and signifies the following version changes:

• MAJOR version increase
• MINOR version increase
• PATCH version increase

Changes:

This PR makes the following changes:

• GitGraph React component using react-flow-renderer to display nodes (i.e. git commits) and edges (i.e. parent-child commit relationships).
• dagre for layout based on the combined expertise in algorithms and methods described in Gansner, et al., "A Technique for Drawing Directed Graphs", Jünger and Mutzel, "2-Layer Straightline Crossing Minimization", Barth, et al., "Simple and Efficient Bilayer Cross Counting", and Brandes and Köpf, "Fast and Simple Horizontal Coordinate Assignment".
• Possible alternatives (not included in this PR) include: uber/react-digraph, airbnb/visx, and Observable - Tangled tree visualization (which requires running the observablehq/runtime as a notebook data platform).
• Additional boundary configurations were inspired by Zhang and Pang, "Graph Layout with Versatile Boundary Constraints", which included heuristics for layout bounding based on aesthetic determinants.

Checklist:

Before submitting this PR, I have verified that my code:

• Resides on a fix/ or feature/ branch that was initially branched off from development.
• Passes code linting (yarn lint) and unit testing (yarn test).
• Successfully builds a distribution package (yarn package).

Additionally, I have verified that:

• My name is listed in the Contributors section, or this PR includes a request to add my name.
• I have read and am aware of the CONTRIBUTING guide for this project.