CENG-355: Add `--show-all` flag to display all results from repo/package list

[BartoszBlizniak]

This PR includes the suggestion/contribution from PR 171 (Issue 170)

• Added --show-all flag to all supported pagination elements (Repo, Package, Upstream, Policy)
• Updated unit tests to reflect the change
• Include code from PR 168 that uploads the ZipApp to the repo
• Added black formatting step to Contribution docs
• Added slug_perm to documentation for dependency command for clarity

[qlty-cloud-legacy[bot]]

Code Climate has analyzed commit ce41ea2d and detected 10 issues on this pull request.

Here's the issue category breakdown:

Category	Count
Complexity	8
Duplication	2

The test coverage on the diff in this pull request is 87.5% (50% is the threshold).

This pull request will bring the total coverage in the repository to 73.4% (1.1% change).

View more on Code Climate.