[fix] Improve screen reader experience of character count component

[kleinschmidtj]

ReactUSWDS Version & USWDS Version:

ReactUSWDS 5.1.1

Describe the bug

The character count component contains a hint that announces how many characters are left. For screen readers, this announcement (since it has aria-live) can be disruptive as it announces immediately and doesn't wait for SR users to stop typing.

To Reproduce
Steps to reproduce the behavior:

1. Go to https://trussworks.github.io/react-uswds/?path=/story/components-charactercount--text-input
2. Start NVDA in Firefox. (Or use another screen reader.)
3. Start typing "test" in the input field
4. See that the screenreader needs to announce each character limit update. The output below:

Example output text from NVDA:
t
24 characters left
24 characters left This is an input with a character counter.
e
23 characters left
23 characters left This is an input with a character counter.
s
22 characters left
22 characters left This is an input with a character counter.
t
21 characters left
21 characters left This is an input with a character counter.

Expected behavior

Using the approach outlined in uswds/uswds#4976, we can use a 1 second delay so that the screen reader reads the update after the user is done typing.

Screenshots

Additional context

uswds/uswds#4976

Device and Browser Information (please complete the following information if describing a UI bug):