Add support for character input (`'A'`, `'B'`, `'C'`) in `isPressed()`#33

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AntonioBerna wants to merge 2 commits intoarduino-libraries:mainfrom

AntonioBerna:feature/button-alias-char

Commits on Apr 30, 2025

feat(buttons): allow isPressed() to accept 'A', 'B', 'C' as input
AntonioBerna
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Update example to document support for both numeric and letter indices :recycle:
AntonioBerna
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