Add support for class members #7478

Job	Run time
Build LPython to WASM	1m 12s
Build Jupyter Kernel	3m 30s
LPython CI (3.10, ubuntu-latest)	7m 54s
Test CPython Interop (@pythoncall)	1m 33s
LPython CI (3.10, macos-latest)	9m 10s
Check Debug build	2m 29s
LPython CI (3.10, windows-2019)	13m 29s
Run Integration tests with Python 3.9	2m 30s
Check Release build	2m 22s
Run Integration tests with Python 3.10	1m 55s
Run SymPy tests	2m 55s
Run Integration tests with Python 3.11	2m 39s
Test LLVM 10	2m 24s
Test PIP Installable Packages	1m 19s
Run Integration tests with Python 3.12	1m 50s
Test LLVM 15	2m 29s
Test LLVM 16	2m 33s
Upload Tarball	36s
	1h 2m 49s

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