Milestone here

Breaking Changes:

1. Remove some default parsing extensions (Remove most default-extensions, preferring a minimal install by default #106)
   • @app-config/v1-compat
   • @app-config/encryption
   • @app-config/git
2. Review and rename options for parsing extensions where it makes sense
   • Remove options prefixed with $ in $substitute and $envVar directives
   • Remove parsing options of $envVar and $substitute, replace with directive (Create $parse directives #134)
3. Add a "context" object when parsing (Provide hierachical "context" object in parsing extensions, allowing for things like $extends with a specific environment #129) to enable $extends with env override (Provide $extends and $override with a specific environment #131)
   • Use this for the "env trio options" (current env, aliases, and var names)
4. Changes to the Node.js API
   • default-extensions options removed in favour of using parsing context
   • FlexibleFileSource constructor args (removing deprecated type)
   • currentEnvironment arguments
5. Removing any unnecessary Node.js exports from @app-config/main
6. Upgrade AJV to v8, and ajv-formats to v2