feat: add IsUrl

[osintalex]

Here's a first go at this. I didn't write too many test cases since most of the Url checking logic is already tested in Pydantic.

[codecov[bot]]

Codecov Report

Merging #47 (8f270ef) into main (42c5594) will decrease coverage by 0.27%. The diff coverage is 95.12%.

Additional details and impacted files

@@             Coverage Diff             @@
##              main      #47      +/-   ##
===========================================
- Coverage   100.00%   99.72%   -0.28%     
===========================================
  Files           12       11       -1     
  Lines          709      737      +28     
  Branches       180      188       +8     
===========================================
+ Hits           709      735      +26     
- Misses           0        2       +2     

Impacted Files	Coverage Δ
dirty_equals/_other.py	98.46% <95.12%> (-1.54%)	:arrow_down:
dirty_equals/__init__.py

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[osintalex]

Ready for review!

Sorry I couldn't figure out how to test the optional import of Pydantic throwing an error.

This was the closest I got but it doesn't work since the mocked_pydantic object is just imported in ._other.py rather than called.

def test_import_error_throws():
    import sys
    from unittest.mock import Mock
    mocked_pydantic = Mock(side_effect=ImportError)
    sys.modules['pydantic'] = mocked_pydantic
    with pytest.raises(
            ImportError,
            match='pydantic is not installed, run `pip install dirty-equals[pydantic]`',
    ):
        from dirty_equals import IsUrl
    assert 'https://example.com' == IsUrl