feat(typography): allow overrides of inputRule outputs

[bdbch]

Please describe your changes

This PR adds the option to replace the output of the inputRules used for the Typography extension.

With this PR users can now do something like this to add overrides to specific characters:

Typography.configure({
  oneHalf: "1 / 2", // this will insert "1 / 2" instead of the default "½"
})

How did you accomplish your changes

Instead of just passing static strings, I used callback functions that will return a new inputRule with said override (if it exists)

How have you tested your changes

I added a local test for my change which worked + I tried out the inputRule override manually.

How can we verify your changes

Check out this PR or go to the deployed demo and try out to replace -> to =====> on the TypographyWithOverrides demo page.

Remarks

/

Checklist

• The changes are not breaking the editor
• Added tests where possible
• Followed the guidelines
• Fixed linting issues

Related issues

closes #2598

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[Haraldson]

Awesome work!