special case types.DynamicClassAttribute as property-like #13888

Job	Run time
Test mypyc suite with 32-bit Python	7m 0s
Test suite with py38-ubuntu, mypyc-compiled	17m 56s
Test suite with py38-windows-64	20m 21s
Test suite with py39-ubuntu	17m 32s
Test suite with py310-ubuntu	16m 46s
Test suite with py311-ubuntu, mypyc-compiled	15m 56s
Test suite with py312-ubuntu, mypyc-compiled	18m 8s
Test suite with py313-ubuntu, mypyc-compiled	18m 33s
mypyc runtime tests with py39-macos	4m 24s
Type check our own code (py38-ubuntu)	1m 53s
Type check our own code (py38-windows-64)	2m 16s
Formatting and code style with Black + ruff	56s
	2h 21m 41s

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