Add bindings for algorithms/count

[alejandrosame]

Description

This PR adds python bindings for file algorithms/count.h. After different iterations, the approach used here is to provide custom code execution through C++ anonymous functions.

Fixes #22

Type of change

Please mark options that are relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Did you run make test-all? Yes

Checklist:

• New Unit tests added
• Unit tests pass locally with my changes

[chinmayshah99]

This is lambda function approach is interesting. As discussed, we will take a call on what approach we should take by our weekly team call.