Confluence: Add function get_all_pages_by_space_ids_confluence_cloud

[Baarsgaard]

I recently was tasked with bulk exporting metadata about all pages in specific spaces and found out there's a perfect endpoint for that.
It just was not available in the library.

[Baarsgaard]

Formatting has been fixed, on another note, would you accept a PR adding a docker-fmt target to the Makefile?:

docker-fmt: docker-qa-build
        docker run --rm -v `pwd`:/atlassian-python-api $(QA_CONTAINER) tox -e black_fmt

and tox.ini (Not added to the tox.envlist)

[testenv:black_fmt]
basepython = python3
target-version = ["py37"]
skip_install = true
deps = black
commands = black {[base]linting_targets} --exclude __pycache__

[gonchik]

@Baarsgaard Sure, feel free to add PR regarding improvements of infra tasks

[codecov]

Codecov Report

Attention: Patch coverage is 3.03030% with 32 lines in your changes missing coverage. Please review.

Project coverage is 34.29%. Comparing base (9b40bb1) to head (b68190e).
Report is 9 commits behind head on master.

Files with missing lines	Patch %	Lines
atlassian/confluence.py	3.03%	32 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1460      +/-   ##
==========================================
- Coverage   34.42%   34.29%   -0.14%     
==========================================
  Files          46       46              
  Lines        8627     8664      +37     
  Branches     1611     1622      +11     
==========================================
+ Hits         2970     2971       +1     
- Misses       5530     5566      +36     
  Partials      127      127              

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