Unsigned int support #7671

Job	Run time
Build LPython to WASM	7m 8s
Test PIP Installable Packages	2m 52s
LPython CI (3.10, macos-latest)	9m 18s
LPython CI (3.10, ubuntu-latest)	13m 19s
LPython CI (3.10, windows-2025)	18m 40s
Build Jupyter Kernel	4m 7s
Test LLVM 10	3m 24s
Test LLVM 16	3m 32s
Test LLVM 15	3m 22s
Test CPython Interop (@pythoncall)	3m 6s
Check Debug build	3m 27s
Upload Tarball	49s
Check Release build	6m 56s
Run SymPy tests	3m 33s
Run Integration tests with Python 3.12	6m 51s
Run Integration tests with Python 3.10	4m 9s
Run Integration tests with Python 3.9	4m 0s
Run Integration tests with Python 3.11	4m 5s
	1h 42m 38s

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