React Toolkit + Core Library Upgrades (Webpack 5, Electron 13)

[nelsonni]

Description:

Migration to React Toolkit. React Toolkit makes it easier to write good Redux applications and speeds up development, by baking in recommended best practices, providing good default behaviors, catching mistakes, and allowing for writing simpler code. The primary advantage for Synectic is the reduction of boilerplate code for creating Redux reducers, built-in support for asynchronous thunks, and cleaner TypeScript typing inferences.

This PR resolves #518, #487, #468, #401, and signifies the following version changes (per Semantic Version):

• MAJOR version increase

Changes:

This PR makes the following changes:

• Migrate to React Toolkit, specifically using:
  • configureStore()
  • createSlice()
  • createAsyncThunk()
  • createEntityAdapter()
  • And relying on immer library for all immutable state updates
• Update to Electron 13.0
• Update to Webpack 5.0
• mock-fs-promise library for asynchronous tests that require real filesystem objects
• mock-git-promise library for testing git-aware commands that require a functioning git repository (maintained by initializing a git repository within the temporary file structure created by mock-fs-promise)
• useWatcher custom React Hook for creating and managing FS watchers automatically
• useGitDirectory custom React Hook for responding to useWatcher events with metafile updates for any subsequent git status changes
• useDirectory custom React Hook for managing useGitDirectory events and efficiently splitting files and subdirectories for a root directory path

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