Add @ni/unit-format library

[rajsite]

Pull Request

🤨 Rationale

Moves UnitFormat to a standalone npm library and modifies it to be usable from both browser and node applications.

👩‍💻 Implementation

• Added @ni/unit-format using node esm compliant import paths
• Breaking: Renamed types to align with folder layout and with nimble components naming conventions, see discussion.
  • Did regex searches for \w+unitformat and \w+unitscale which are the primary uses of the public api for missed renames

🧪 Testing

• Added jasmine node and karma browser tests
• Draft SystemLinkShared PR, looks like usage was well-encapsulated so trivial change

✅ Checklist

• I have updated the project documentation to reflect my changes or determined no changes are needed. Added README and Contributing for library.

[rajsite]

@jattasNI ready for review, won't bypass since it's a breaking change and to review the public api export names (i.e. biggest thing to focus on is the nimble-components and nimble-angular imports of @ni/unit-format)