String attribute methods #7520

Job	Run time
Build LPython to WASM	6m 6s
LPython CI (3.10, ubuntu-latest)	9m 2s
LPython CI (3.10, windows-2019)	12m 8s
LPython CI (3.10, macos-latest)	7m 28s
Test CPython Interop (@pythoncall)	1m 28s
Check Debug build	2m 24s
Test PIP Installable Packages	1m 18s
Check Release build	2m 16s
Build Jupyter Kernel	3m 25s
Run SymPy tests	2m 6s
Run Integration tests with Python 3.12	2m 24s
Run Integration tests with Python 3.10	1m 42s
Test LLVM 15	2m 24s
Test LLVM 10	2m 19s
Test LLVM 16	2m 20s
Upload Tarball	43s
Run Integration tests with Python 3.9	1m 38s
Run Integration tests with Python 3.11	1m 36s
	1h 2m 47s

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