Utils: Use single class for handling locks

[nijel]

Proposed changes

• The code is now shared for repo and component level locking
• It prefers Redis based locking as that usually performs better
• The Redis locks will also nicely work in a distributed environment
  (Support object store besides file store for persistancy in Weblate #2984)

Checklist

• Lint and unit tests pass locally with my changes.
• I have added tests that prove my fix is effective or that my feature works.
• I have added documentation to describe my feature.
• I have squashed my commits into logic units.
• I have described the changes in the commit messages.

Other information

[codecov]

Codecov Report

Merging #5838 (9a3bfa8) into main (84ba90b) will decrease coverage by 0.00%.
The diff coverage is 72.41%.

@@            Coverage Diff             @@
##             main    #5838      +/-   ##
==========================================
- Coverage   91.56%   91.55%   -0.01%     
==========================================
  Files         608      609       +1     
  Lines       45778    45809      +31     
  Branches     5044     5047       +3     
==========================================
+ Hits        41917    41942      +25     
- Misses       2591     2595       +4     
- Partials     1270     1272       +2     

Impacted Files	Coverage Δ
weblate/trans/exceptions.py	100.00% <ø> (ø)
weblate/trans/views/git.py	88.63% <50.00%> (ø)
weblate/utils/lock.py	66.66% <66.66%> (ø)
weblate/trans/models/component.py	82.62% <83.33%> (+0.53%)	⬆️
weblate/glossary/tasks.py	88.88% <100.00%> (ø)
weblate/trans/bulk.py	95.58% <100.00%> (ø)
weblate/trans/tasks.py	74.80% <100.00%> (-0.29%)	⬇️
weblate/vcs/base.py	92.51% <100.00%> (+0.02%)	⬆️
weblate/utils/version.py	73.91% <0.00%> (-11.09%)	⬇️
... and 10 more