[10.x] Add check if the string is hex color

[michaelnabil230]

This PR adds a to check if the string is a hex color

$isHexColor = Str::isHexColor('#FFFFFF');

// Or

$isHexColor = str('#FFFFFF')->isHexColor();

[ahinkle]

What could be the practical use of this? While a validator rule would be valuable, a string helper is not likely to see frequent use.

[michaelnabil230]

Hello @ahinkle,

Using Str::isHexColor() can be beneficial in various scenarios, including:

• Unit Testing: It helps ensure the code correctly handles hex color codes and identifies potential issues related to invalid color codes.

• Third-Party Integrations: It prevents errors caused by invalid color codes received from external sources when integrating with third-party APIs or libraries.

• Data Cleaning and Sanitization: It filters out invalid hex color codes, ensuring data integrity when processing data from external sources or user input.