feat: add between function to Date module

[Mounayer]

Description

Closes #937

Added two between functions to the Date module, like: https://fakerjs.dev/api/date.html#between

One function to support two ISO Dates:

std::string between(std::string from, std::string to, DateFormat dateFormat)

One function to support two Timestamps:

std::string between(int64_t from, int64_t to, DateFormat dateFormat)

Made sure to write tests that cover edge cases, and added docs.

Testing

Automated

Run tests, and make sure they pass

Manual

Build and use faker in some cpp file and try out the new functions yourself, i.e.:

faker::date::between("2021-01-01T00:00:00Z", "2022-01-01T00:00:00Z", DateFormat::ISO); // Returns a random date between Jan 1, 2021, and Jan 1, 2022, formatted as "2021-06-15T12:34:56Z"
faker::date::between("2021-01-01T00:00:00Z", "2022-01-01T00:00:00Z", DateFormat::Timestamp); // Returns the Unix timestamp of a random date between Jan 1, 2021, and Jan 1, 2022

and

faker::date::between(1609459200, 1640995200, DateFormat::ISO); // Returns a random date between Jan 1, 2021, and Jan 1, 2022, formatted as "2021-06-15T12:34:56Z" 
faker::date::between(1609459200, 1640995200, DateFormat::Timestamp); // Returns the Unix timestamp of a random date between Jan 1, 2021, and Jan 1, 2022

[cieslarmichal]

Great job! 😁

[Mounayer]

Great job! 😁

Thank you! It's my first contribution to a large project, and I gotta say, the code was very readable!

[cieslarmichal]

Feel free to contribute more and join discord channel 😎💪