feat(themes): add md theme tokens and update ionic theme to include semantic tokens (#30734)

- Updates the theme tokens interface to add more numeric tokens & semantic tokens
- Moves the `config` values into a separate `config` option which uses the `IonicConfig` interface
  - Adds a config option for `formHighlight` to `IonicConfig`
- Defines default & dark tokens for the `md` theme
- Removes the numeric tokens from the `ionic` theme and adds semantic tokens
- Remove the numerous `--ion-font-family` overrides in favor of the tokens

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Co-authored-by: Brandy Smith <6577830+brandyscarney@users.noreply.github.com>