[Rebase] Add support for Check Suites

[dhruvmanila]

Continuing on the work done by @wrecker in #1646

As mentioned in the latest review: #1646 (review)

• Properties are 'type' not 'rtype'
• This actually calls a URL, so this needs more detail.
• Fixed merge conflicts.

NOTE: I will add other CheckSuite API endpoints in a couple of days.

@sbesson Should the other endpoints be included in this PR and thus, in the next release?

[codecov-io]

Codecov Report

Merging #1764 (2455455) into master (197e065) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1764   +/-   ##
=======================================
  Coverage   98.75%   98.76%           
=======================================
  Files          50       51    +1     
  Lines        2660     2677   +17     
=======================================
+ Hits         2627     2644   +17     
  Misses         33       33           

Impacted Files	Coverage Δ
github/RepositoryPreferences.py	100.00% <100.00%> (ø)

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[dhruvmanila]

It also seems that the Checks API graduated from their preview period. I shall remove the preview headers soon.

[sbesson]

@dhruvmanila thanks for doing this, I have quickly tested this PR in the context of our library and at least I can confirm all the check suites endpoints we would need on our side are present and functional. 💯

As per the other endpoints, I think you referred to list check runs in a check suite in the previous PR which makes sense. Is there anything else?

[dhruvmanila]

This one creates a check suite and this one updates repository preferences for check suites and the last one you mentioned.

By default, GitHub automatically creates a check suite each time code is pushed to a repository, changing the preferences for each app allows you to be in control of when you want the check suite to be created. I don't know where this could be useful.

[s-t-e-v-e-n-k]

Make certain that you attribute @wrecker in your commit if you haven't. I have some concerns which I've highlighted inline, but other than that, thanks for addressing my comments from the previous PR.

[dhruvmanila]

I pulled down the commits made by @wrecker and rebased it on the latest upstream. So, all the commits still attribute @wrecker as their author. The three commits made by @wrecker in this pull request:

• 9bd5c9f
• 2df00d1
• 897744c

[dhruvmanila]

@s-t-e-v-e-n-k @sbesson All endpoints have been added, please take a look at the new changes made.