use TypedDict for return type of legacy detect() (#469) #323

Job	Run time
🎨 Linters	13s
✅ Tests (3.7)	26s
⏪ Chardet Backward-Compatibility Test	1m 33s
✅ Tests (3.8)	23s
✅ Tests (3.9)	20s
✅ Tests (3.10)	22s
✅ Tests (3.11)	22s
✅ Tests (3.12)	25s
📈 Detection Coverage	1m 13s
⚡ MypyC Tests (3.7, ubuntu-latest)	1m 51s
⚡ MypyC Tests (3.7, macos-latest)	5s
⚡ MypyC Tests (3.7, windows-latest)	2m 49s
⚡ MypyC Tests (3.8, ubuntu-latest)	1m 54s
⚡ MypyC Tests (3.8, macos-latest)	1m 58s
⚡ MypyC Tests (3.8, windows-latest)	3m 7s
⚡ MypyC Tests (3.9, ubuntu-latest)	1m 43s
⚡ MypyC Tests (3.9, macos-latest)	1m 28s
⚡ MypyC Tests (3.9, windows-latest)	2m 22s
⚡ MypyC Tests (3.10, ubuntu-latest)	1m 48s
⚡ MypyC Tests (3.10, macos-latest)	1m 25s
⚡ MypyC Tests (3.10, windows-latest)	2m 40s
⚡ MypyC Tests (3.11, ubuntu-latest)	1m 30s
⚡ MypyC Tests (3.11, macos-latest)	1m 9s
⚡ MypyC Tests (3.11, windows-latest)	2m 56s
⚡ MypyC Tests (3.12, ubuntu-latest)	1m 33s
⚡ MypyC Tests (3.12, macos-latest)	1m 8s
⚡ MypyC Tests (3.12, windows-latest)	2m 43s
⚡ Performance Test (no MypyC)	0s
	39m 26s

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