chore: fix typing issues

[masci]

• Fixed typing issues as reported by pyright, codebase is clean now.
• Extracted a dict-like base class for a better semantic of DictState that used to derive from Event only to use its dict-like behaviour

[coveralls]

Pull Request Test Coverage Report for Build 16591734183

Details

• 18 of 18 (100.0%) changed or added relevant lines in 3 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.05%) to 95.036%

---

Files with Coverage Reduction	New Missed Lines	%
src/workflows/handler.py	1	95.89%

Totals
Change from base Build 16525416513:	-0.05%
Covered Lines:	1302
Relevant Lines:	1370

---

💛 - Coveralls

[logan-markewich]

Seems safe!