Add emirp number detection algorithm

[aqib-m31]

Describe your change:

Add emirp number detection algorithm.
Implemented functions is_prime and emirp_check to determine whether a given number is an emirp number. An emirp number is a prime number that yields a different prime number when its digits are reversed.

• Add an algorithm?
• Fix a bug or typo in an existing algorithm?
• Add or change doctests? -- Note: Please avoid changing both code and tests in a single pull request.
• Documentation change?

Checklist:

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• All new Python files are placed inside an existing directory.
• All filenames are in all lowercase characters with no spaces or dashes.
• All functions and variable names follow Python naming conventions.
• All function parameters and return values are annotated with Python type hints.
• All functions have doctests that pass the automated testing.
• All new algorithms include at least one URL that points to Wikipedia or another similar explanation.
• If this pull request resolves one or more open issues then the description above includes the issue number(s) with a closing keyword: "Fixes #ISSUE-NUMBER".

[imSanko]

Can we do something like this?

    """
    Check if a number is an emirp number.
    Args:
        number: A positive integer.
    Returns:
        True if the number is an emirp number, False otherwise.
    Raises:
        ValueError: If number is not a positive integer.
    Examples:
        >>> emirp_check(13)
        True
        >>> emirp_check(23)
        False
        >>> emirp_check(9679)
        True
        >>> emirp_check(5)
        False
        >>> emirp_check(0)
        Traceback (most recent call last):
            ...
        ValueError: Input must be a positive integer.
        >>> emirp_check(-13)
        Traceback (most recent call last):
            ...
        ValueError: Input must be a positive integer.
        >>> emirp_check(1.9)
        Traceback (most recent call last):
            ...
        ValueError: Input must be a positive integer.
        >>> emirp_check("cat")
        Traceback (most recent call last):
            ...
        ValueError: Input must be a positive integer.
        >>> emirp_check(17)
        True
        >>> emirp_check(31)
        True
        >>> emirp_check(79)
        False
        >>> emirp_check(101)
        False
    """

[aqib-m31]

We can do it this way as well.
But >>> emirp_check(79) will not yield False it will yield True as 79 is an emirp number.
@imSanko

[imSanko]

Great!!