Unsigned int support #7679

Job	Run time
LPython CI (3.10, ubuntu-latest)	9m 52s
LPython CI (3.10, windows-2025)	18m 43s
LPython CI (3.10, macos-latest)	9m 12s
Build LPython to WASM	7m 34s
Test PIP Installable Packages	2m 55s
Check Release build	6m 30s
Test CPython Interop (@pythoncall)	3m 0s
Upload Tarball	49s
Run Integration tests with Python 3.9	3m 23s
Run Integration tests with Python 3.10	3m 16s
Run Integration tests with Python 3.11	3m 49s
Run Integration tests with Python 3.12	6m 52s
Check Debug build	3m 3s
Run SymPy tests	4m 41s
Build Jupyter Kernel	4m 0s
Test LLVM 10	3m 7s
Test LLVM 15	3m 8s
Test LLVM 16	3m 6s
	1h 37m 0s

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