Add numpy logs to transformations

[henriqueribeiro]

As title states, this PR adds logs function to the available transformations

[philippjfr]

One of the existing tests will need to be updated, otherwise this looks fine to me:

  File "/home/travis/build/pyviz/holoviews/holoviews/tests/util/testtransform.py", line 173, in test_ufunc_expression_repr
    self.assertEqual(repr(np.log(dim('float'))), "np.log(dim('float'))")
  File "/home/travis/build/pyviz/holoviews/holoviews/element/comparison.py", line 79, in assertEqual
    asserter(first, second)
  File "/home/travis/build/pyviz/holoviews/holoviews/element/comparison.py", line 56, in simple_equality
    raise cls.failureException(msg or standardMsg)
AssertionError: "dim('float').log()" != "np.log(dim('float'))"

[philippjfr]

Thanks a lot for contributing!

[henriqueribeiro]

Just fixed the test @philippjfr

[jlstevens]

Thanks for the PR @henriqueribeiro!

[github-actions]

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