Add support for Packages API

[Cyb3r-Jak3]

Adds support for Packages API through expansion of Users and Organization Services.

Would resolve #2075

[gmlewis]

Thank you, @Cyb3r-Jak3 !
This is off to a great start. I have to run now, but will continue my review later.
This should give you a good idea of what I'm looking for.

[gmlewis]

Thank you, @Cyb3r-Jak3 , but I'm going to hold off on a complete review until all unit tests are passing.
It looks like they are currently failing here:

    orgs_packages_test.go:208: Request parameters: map[state:[deleted]], want map[page:[2] per_page:[10] state:[deleted]]
--- FAIL: TestOrganizationsService_ListPackagesVersions (0.00s)

Please see our CONTRIBUTING.md guide to show you how to run the tests before pushing changes. Thanks.

[Cyb3r-Jak3]

@gmlewis, sorry about that. All good now.

[codecov]

Codecov Report

Merging #2076 (c0223f6) into master (ee49f8e) will decrease coverage by 0.00%.
The diff coverage is 97.59%.

@@            Coverage Diff             @@
##           master    #2076      +/-   ##
==========================================
- Coverage   97.77%   97.77%   -0.01%     
==========================================
  Files         109      111       +2     
  Lines        9720     9932     +212     
==========================================
+ Hits         9504     9711     +207     
- Misses        150      154       +4     
- Partials       66       67       +1     

Impacted Files	Coverage Δ
github/packages.go	85.71% <50.00%> (-14.29%)	⬇️
github/orgs_packages.go	96.42% <96.42%> (ø)
github/users_packages.go	100.00% <100.00%> (ø)
github/actions_runner_groups.go	100.00% <0.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ee49f8e...c0223f6. Read the comment docs.

[gmlewis]

Thank you, @Cyb3r-Jak3 !
This looks great! I really appreciate your patience with me and my reviews.
LGTM.

Awaiting second LGTM before merging.

[Cyb3r-Jak3]

@wesleimp Nudge

[gmlewis]

@Parker77 - if you have time to do a code review, that would be greatly appreciated.

[Parker77]

LGTM.

[gmlewis]

LGTM.

Thank you, @Parker77 !
Merging.