Add JSON output and do way too much other stuff

[nickgerace]

General changes:

• Add JSON output flag for version and results
• Add color mode with the following options: "always", "compatibility", and "never"
• Merge CLI functions into "parse_and_run()"
• Major module changes: "cli", "display", and "report" modules now contain their children, which are "logging", "color", and "target" respectively
• Add result type and remove "anyhow" dependency to reduce binary size and simplify errors (rely more on "thiserror").
• Ensure "Status" has bi-directional serialization for JSON output.
• Re-write tests to create and use actual files, directories, and newly initialized repositories in the "target" directory
• Ensure CHANGELOG for the upcoming release is closer to the original "Keep a Changelog" format"

Bug fixes:

• Fix a bug where HEAD was not being detected using "git2::Repository::head()" in a newly initialized repository
• Fix a bug where encountering a "NotFound" error with a repository's remote "origin" would cause a panic

CI changes:

• Rename CI workflows to be more explicit
• Remove "rust-cache" from nightly workflow and add comment for its reasoning

Makefile changes:

• Refactor README to only remove unused targets
• Add nextest target
• Add size target

Bench script changes:

• Require grealpath on macOS
• Suppress command output and only display times

Additional comment: I am probably missing some stuff here. I was on a flight and did not have internet. My brain went nuts and... well, here we are.

Closes #176 Closes #180

[nickgerace]

bors merge

[bors[bot]]

Build succeeded:

• Build (macos-latest)
• Build (windows-latest)
• Clippy Lint, Test, and Build (ubuntu-latest)
• Nightly Fmt Check