add announce to textarea for character limit

[britt6612]

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What does this PR do?

This PR adds max and threshold directly on the formfield in our example

Where should the reviewer start?

CharacterCounterExample.js

What testing has been done on this PR?

locally
In addition to the feature you are implementing, have you checked the following:

General UX Checks

• Small, medium, and large screen sizes
• Cross-browsers (FireFox, Chrome, and Safari)
• Light & dark modes
• All hyperlinks route properly

Accessibility Checks

• Keyboard interactions
• Screen reader experience
• Run WAVE accessibility plugin (Chrome)

Code Quality Checks

• Console is free of warnings and errors
• Passes E2E commit checks
• Visual snapshots are reasonable

How should this be manually tested?

locally with voice over

Any background context you want to provide?

our examples were not following the guidance in which we provide

What are the relevant issues?

closes #3787

Screenshots (if appropriate)

Should this PR be mentioned in Design System updates?

no

Is this change backwards compatible or is it a breaking change?

backwards compatible

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Latest commit: ec3cf0f

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[jcfilben]

The announcement keeps getting cut off before it reads out. Also I think since the validate max and threshold behavior is built into Grommet it would be nice to also have the announcements for it built into grommet so that people don't need to manually add them

[britt6612]

going to move this code to grommet to be built in.