REF: Define ops on Resampler as normal methods

[rhshadrach]

Ref: #48980 (review)

Similar to #48400 with groupby, we should define methods on the Resampler class rather than setting them as attributes after the class definition. While this involves a little more boilerplate code, it is more straightforward to understand and easier to enhance or extend.

[erikcek]

take

[Pvlb1998]

Is this issue still possible do Take?

[rhshadrach]

@Pvlb1998 - yes, comment take and it will be assigned to you.

[lucaslarios]

hello, could you specify a little better the purpose of the issue? in which file is this class found? Is there any solution suggestion?