Suggestion: create simple_cellphone_number format

[dlwrnc]

• Faker version: faker 18.4.0
• OS: mac os monterey

Ideal behavior

Ideal behavior would be a situation where it's possible to create only phone numbers of format ##########. I've found a few forms that are built to only expect a "basic" ten-digit phone number.

Actual behavior

Actual behavior is that there's no way to define the ideal phone number format so narrowly in the existing code.

My suggested change is to the en_US file, adding a format type like:

simple_format = ('##########', '###-###-####')

and then a

    def simple_cellphone_number(self) -> str:
        pattern: str = self.random_element(self.simple_format)
        return self.numerify(self.generator.parse(pattern))

happy to make this change myself. :)