feat(changelog): add support for single version and version range

[woile]

Closes #399 #225

Description

Allows the creation of a changelog for the given version, supports:

cz changelog --dry-run 1.0.0..2.0.0

cz changelog --dry-run 1.0.0

Checklist

• Add test cases to all the changes you introduce
• Run ./script/format and ./script/test locally to ensure this change passes linter check and test
• Test the changes on the local machine manually
• Update the documentation for the changes

Expected behavior

Steps to Test This Pull Request

1. Move to the branch of this PR
2. Run the commands given above

TODO

• Tests
• Syntax approval: do you think this syntax would be okay?

Additional context

Closes #399 #225

[codecov]

Codecov Report

Merging #400 (4bb9131) into master (e6f1dc3) will increase coverage by 0.00%.
The diff coverage is 98.75%.

@@           Coverage Diff           @@
##           master     #400   +/-   ##
=======================================
  Coverage   98.05%   98.06%           
=======================================
  Files          39       39           
  Lines        1441     1499   +58     
=======================================
+ Hits         1413     1470   +57     
- Misses         28       29    +1     

Flag	Coverage Δ
unittests	98.06% <98.75%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
commitizen/cli.py	97.61% <ø> (ø)
commitizen/commands/changelog.py	96.59% <95.45%> (-0.82%)	⬇️
commitizen/__version__.py	100.00% <100.00%> (ø)
commitizen/bump.py	100.00% <100.00%> (ø)
commitizen/changelog.py	97.25% <100.00%> (+0.77%)	⬆️
commitizen/commands/bump.py	95.19% <100.00%> (ø)
commitizen/config/toml_config.py	100.00% <100.00%> (ø)
commitizen/cz/__init__.py	100.00% <100.00%> (ø)
commitizen/exceptions.py	100.00% <100.00%> (ø)
commitizen/git.py	100.00% <100.00%> (ø)
... and 1 more

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[woile]

Lots of progress, I just have to fix and add some tests for the ranges:

0.2.0..0.3.0
0.3.0..0.4.0

[woile]

@Lee-W can u test this PR locally? the tests are passing on my machine, not sure why they are failing now 🤔

The PR is ready 🎉

[Lee-W]

I might need some more time to fully review it but I just found out the reason of these failing tests. The date of tmp_git_project is decided by the time we run the tests which cannot be easily pinned by freezegun. Not sure whether there's work around for this case. If not, we might need to use traditional assertion instead of pytest-regression in the tests that depends on date.

[woile]

Thanks for the info, I understand it better now, I'm gonna check what can be done

[woile]

@Lee-W could you help me with this one? No clue why it's failing and they are passing locally. I patched the gittag date to avoid the problem with git timestamp and it works locally

[woile]

@Lee-W can u take a look? I think is ready

[Lee-W]

I'm a bit busy these days. Will try to take a look ASAP. 🙏

[Lee-W]

It's so much work 💪 Hope I can be as productive during next week's development sprint. I've left some comments and questions.

[Lee-W]

Sorry for taking so long. Let's merge it!