Add support for class members #7477

Job	Run time
Build Jupyter Kernel	3m 33s
Test CPython Interop (@pythoncall)	3m 45s
LPython CI (3.10, ubuntu-latest)	7m 24s
LPython CI (3.10, macos-latest)	3m 56s
Build LPython to WASM	1m 17s
Check Debug build	3m 33s
LPython CI (3.10, windows-2019)	12m 35s
Check Release build	2m 7s
Run Integration tests with Python 3.9	3m 59s
Run SymPy tests	4m 26s
Test LLVM 10	3m 31s
Run Integration tests with Python 3.10	4m 7s
Test LLVM 15	4m 2s
Run Integration tests with Python 3.11	4m 13s
Test PIP Installable Packages	3m 28s
Run Integration tests with Python 3.12	3m 57s
Test LLVM 16	3m 34s
Upload Tarball	37s
	1h 14m 4s

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