Accept `Map<String, dynamic>` in `Hint` class #244

Job	Run time
cancel-previous-workflow	2s
android \| ubuntu-latest \| stable	1m 8s
android \| ubuntu-latest \| beta	1m 7s
linux \| ubuntu-latest \| stable	1m 21s
linux \| ubuntu-latest \| beta	1m 36s
ios \| macos-latest \| stable	2s
macos \| macos-latest \| stable	2s
windows \| windows-latest \| stable	2m 32s
windows \| windows-latest \| beta	2m 15s
analyze / cancel-previous-workflow	4s
analyze / analyze	1m 58s
analyze / package-analysis	59s
	13m 6s

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