Added comparison function as histogram operation (with colorized + info based string return)

[gohil-jay]

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[gohil-jay]

@henryiii, pre-commit throws few errors... Any feedback/suggestion?

[henryiii]

It's complaining because you are using the result of re.search without checking to see if it has a result first. I think the best fix, though, is to use ._storage_type, which contains the storage type of the histogram, rather than trying to parse it out of the repr.

[gohil-jay]

I've been looking for something like _storage_type since the beginning (couldn't find it on docs or book here)! But alright now it should work :)

[gohil-jay]

Seems alright now (?)

[henryiii]

Note: the goal is to support pytest_assertrepr_compare https://docs.pytest.org/en/latest/how-to/assert.html#defining-your-own-explanation-for-failed-assertions