String attribute methods #7531

Job	Run time
Test PIP Installable Packages	1m 17s
LPython CI (3.10, macos-latest)	7m 33s
LPython CI (3.10, windows-2019)	13m 38s
LPython CI (3.10, ubuntu-latest)	8m 52s
Build LPython to WASM	6m 7s
Check Debug build	2m 28s
Test CPython Interop (@pythoncall)	1m 26s
Check Release build	2m 31s
Upload Tarball	42s
Run SymPy tests	2m 7s
Build Jupyter Kernel	3m 31s
Run Integration tests with Python 3.10	1m 38s
Run Integration tests with Python 3.12	1m 47s
Run Integration tests with Python 3.11	1m 43s
Run Integration tests with Python 3.9	1m 41s
Test LLVM 16	2m 25s
Test LLVM 10	2m 18s
Test LLVM 15	2m 26s
	1h 4m 10s

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