chore(flags): simplify flags storage

[nijel]

Proposed changes

• use single dictionary to hold the values
• add type annotations

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[bot]]

Codecov Report

Attention: Patch coverage is 72.50000% with 11 lines in your changes missing coverage. Please review.

Project coverage is 90.61%. Comparing base (6aee586) to head (126e591). Report is 4215 commits behind head on main.

Files with missing lines	Patch %	Lines
weblate/checks/flags.py	72.50%	8 Missing and 3 partials :warning:

Additional details and impacted files

[](https://app.codecov.io/gh/WeblateOrg/weblate/pull/11924?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=WeblateOrg) ```diff @@ Coverage Diff @@ ## main #11924 +/- ## ========================================== - Coverage 90.82% 90.61% -0.21% ========================================== Files 554 577 +23 Lines 57306 58822 +1516 Branches 9122 9393 +271 ========================================== + Hits 52046 53300 +1254 - Misses 3640 3829 +189 - Partials 1620 1693 +73 ``` | [Files with missing lines](https://app.codecov.io/gh/WeblateOrg/weblate/pull/11924?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=WeblateOrg) | Coverage Δ | | |---|---|---| | [weblate/checks/flags.py](https://app.codecov.io/gh/WeblateOrg/weblate/pull/11924?src=pr&el=tree&filepath=weblate%2Fchecks%2Fflags.py&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=WeblateOrg#diff-d2VibGF0ZS9jaGVja3MvZmxhZ3MucHk=) | `86.72% <72.50%> (-1.48%)` | :arrow_down: | ... and [332 files with indirect coverage changes](https://app.codecov.io/gh/WeblateOrg/weblate/pull/11924/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=WeblateOrg)