Non trivial ret types, fixed math module #7601

Job	Run time
LPython CI (3.10, macos-latest)	5m 19s
LPython CI (3.10, windows-2019)	14m 45s
Build LPython to WASM	7m 23s
LPython CI (3.10, ubuntu-latest)	10m 6s
Test CPython Interop (@pythoncall)	2m 57s
Check Debug build	3m 19s
Run Integration tests with Python 3.10	3m 22s
Build Jupyter Kernel	3m 58s
Run Integration tests with Python 3.12	3m 16s
Test PIP Installable Packages	2m 51s
Check Release build	6m 35s
Run SymPy tests	3m 45s
Run Integration tests with Python 3.11	3m 16s
Upload Tarball	51s
Run Integration tests with Python 3.9	4m 35s
Test LLVM 15	3m 36s
Test LLVM 10	3m 30s
Test LLVM 16	3m 38s
	1h 27m 2s

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