Bitbucket Cloud: Add support for commit/commits endpoint

[flichtenheld]

The API is a bit confusing since commits/ does not give you a commit, but that commit's history. Need to use commit/ to get a specific commit only.

Signed-off-by: Frank Lichtenheld [email protected]

[codecov-commenter]

Codecov Report

Merging #924 (b96191d) into master (6d8545a) will increase coverage by 0.18%. The diff coverage is 73.93%.

@@            Coverage Diff             @@
##           master     #924      +/-   ##
==========================================
+ Coverage   36.67%   36.86%   +0.18%     
==========================================
  Files          34       37       +3     
  Lines        6437     6513      +76     
  Branches      991     1002      +11     
==========================================
+ Hits         2361     2401      +40     
- Misses       3969     4005      +36     
  Partials      107      107              

Impacted Files	Coverage Δ
atlassian/bitbucket/cloud/repositories/commits.py	46.87% <46.87%> (ø)
atlassian/bitbucket/cloud/repositories/__init__.py	62.50% <80.00%> (+0.51%)	:arrow_up:
atlassian/bitbucket/cloud/common/comments.py	85.71% <85.71%> (ø)
atlassian/bitbucket/cloud/common/builds.py	89.13% <89.13%> (ø)
atlassian/bitbucket/cloud/common/users.py	100.00% <100.00%> (ø)
...ssian/bitbucket/cloud/repositories/pullRequests.py	88.88% <100.00%> (-0.90%)	:arrow_down:

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