Feat: Char validator

[Meldiron]

No description provided.

[eldadfux]

Suggested change

	class Char extends Validator
	class Chars extends Validator

Make sense?

[kodumbeats]

To my 👀, this looks to be the Text validator plus a whitelist of chars. Any reason we couldn't just add this functionality there?

new Text(255, [ ...Text::ALPHABET_LOWER, ...Text::ALPHABET_UPPER, ...Text::NUMBERS ]

Where the constructor has a default, empty value for a whitelist
public function __construct(int $length, array $whitelist = []){}

[Meldiron]

@eldadfux @kodumbeats I decided to go with Brandon solution of merging this into a Text validator. Whitelist is optional and ignored if it's an empty array (who would want no allowed characters anyway).

Please revisit the PR 😇