Add the `lpython` pypi package sources #7647

Job	Run time
Build LPython to WASM	7m 21s
LPython CI (3.10, macos-latest)	7m 34s
LPython CI (3.10, ubuntu-latest)	10m 24s
LPython CI (3.10, windows-2019)	13m 53s
Test PIP Installable Packages	2m 47s
Test CPython Interop (@pythoncall)	2m 55s
Test LLVM 10	3m 19s
Build Jupyter Kernel	4m 4s
Check Debug build	3m 24s
Test LLVM 16	3m 24s
Upload Tarball	53s
Run SymPy tests	3m 33s
Run Integration tests with Python 3.10	3m 19s
Test LLVM 15	3m 14s
Check Release build	6m 47s
Run Integration tests with Python 3.12	3m 16s
Run Integration tests with Python 3.9	3m 8s
Run Integration tests with Python 3.11	3m 25s
	1h 26m 40s

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