Confluence: Splitted classes into Cloud and Server

[gonchik]

Confluence: Splited classes into Cloud and Server:

Used the following info
Swagger Server: https://dac-static.atlassian.com/server/confluence/10.0.2.swagger.v3.json?_v=1.1153.73
Doc: https://developer.atlassian.com/server/confluence/rest/v1002/intro/#about
Postman: https://developer.atlassian.com/server/confluence/confluence.1002.postman.json

Confluence Cloud:
Doc: https://developer.atlassian.com/cloud/confluence/rest/v2/intro/#about
Doc: https://developer.atlassian.com/cloud/confluence/rest/v1/intro/#about
https://developer.atlassian.com/cloud/confluence/confcloud.2.postman.json
Swagger Cloud: https://dac-static.atlassian.com/cloud/confluence/openapi-v2.v3.json?_v=1.8071.0-0.1325.0

[codecov]

Codecov Report

❌ Patch coverage is 76.71569% with 95 lines in your changes missing coverage. Please review.
✅ Project coverage is 42.16%. Comparing base (0beb6b6) to head (1c6bcc9).
⚠️ Report is 10 commits behind head on master.

Files with missing lines	Patch %	Lines
atlassian/confluence/base.py	34.54%	34 Missing and 2 partials ⚠️
atlassian/confluence/server/base.py	23.07%	29 Missing and 1 partial ⚠️
atlassian/confluence/cloud/base.py	25.00%	26 Missing and 1 partial ⚠️
atlassian/confluence/server/__init__.py	98.80%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1581      +/-   ##
==========================================
+ Coverage   35.89%   42.16%   +6.27%     
==========================================
  Files          61       66       +5     
  Lines        9787     8599    -1188     
  Branches     1301     1039     -262     
==========================================
+ Hits         3513     3626     +113     
+ Misses       6137     4833    -1304     
- Partials      137      140       +3     

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