Fix 143 --refactor upload to ckan, check for package existence before…

[thepsalmist]

Description

This PR refactors the command to upload_to_ckan, introduces checking for package existence before creating a new ons

Fixes #143

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

Screenshots

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation

[kilemensi]

👍🏽

[VinneyJ]

LGTM. However the handle() function is super long maybe we might consider breaking it down abit.