chore(coreTheme + platformTheme): updating and adding color tokens

Updates + Additions to the core theme red swatches: 
* Updates `red-0` to `red-300` and `red-100` to `red-400`
* Adds a new `red-100` and `red-900`
* Uses the new `red-100` and `red-900` for `background-error`

Updates the Platform Theme to:
* change the `background-primary` light mode color from `beige` to `blue-0`
* update `editor-comment` —  light: `navy-300` => `navy-500` (`#686C7B`), dark: `gray-600` => `white-500` (`#84868D`)
* update `editor-key` — light: `teal-500`'s HEX value from `027E97` to `006D82` 
* update `editor-ui-indent-active` — light: `navy-900` => `navy-300` (`#BCBDC4`), dark: `gray:900` => `white-300`  (`#3B3D49`) 
* update `editor-ui-indent-inactive` — light: `navy-600` => `navy-400` (`#8E919D`), dark: `gray:800` => `white-400` (`#5F616B`)
* add `editor-ui-line-number-active` — light: `navy-700` (`#31374C`), dark: `white-700`  (`#CECFD2`)
* rename and update `editor-ui-line-number` to `editor-ui-line-number-inactive` — light: `navy-300` => `navy-500` (`#686C7B`), dark: `gray:600` => `white-500` (`#84868D`)

Author: LinKCoding