define colors as ts constants

## Use Case

Advances #601 

antd v5 `ConfigProvider` and theming will injest hex colors defined as typescript constants, not as css vars.

Whatever colors and variables we are using in `ant-vars.less` will need to be ported over.

## Acceptance Criteria

The colors from `ant-vars.less` are declared and expored from a `themeColors.ts` file
