[Python] Expose compare kernels on Array class

[asfimport]

Expose the compare kernel for comparing with scalar or array (ARROW-3087, ARROW-4990) on the python Array class.

This can implement the \_\_eq\_\_ et al dunder methods on the Array class.

Reporter: Joris Van den Bossche / @jorisvandenbossche
Assignee: Joris Van den Bossche / @jorisvandenbossche

Related issues:

• [C++] C++ array kernels framework and execution buildout (umbrella issue) (is a child of)

PRs and other links:

• GitHub Pull Request #7273

_{Note: This issue was originally created as ARROW-5854. Please see the migration documentation for further details.}

[asfimport]

Wes McKinney / @wesm:
This should be fairly trivial now

[asfimport]

Wes McKinney / @wesm:
Issue resolved by pull request 7273
#7273