String attribute methods #7518

Job	Run time
Build LPython to WASM	5m 59s
LPython CI (3.10, ubuntu-latest)	7m 23s
LPython CI (3.10, windows-2019)	13m 38s
LPython CI (3.10, macos-latest)	3m 22s
Check Release build	1m 38s
Check Debug build	1m 13s
Test PIP Installable Packages	1m 11s
Test CPython Interop (@pythoncall)	1m 28s
Test LLVM 10	2m 19s
Test LLVM 15	2m 28s
Test LLVM 16	2m 21s
Build Jupyter Kernel	3m 31s
Run Integration tests with Python 3.11	1m 49s
Run SymPy tests	2m 1s
Upload Tarball	41s
Run Integration tests with Python 3.12	1m 43s
Run Integration tests with Python 3.9	1m 37s
Run Integration tests with Python 3.10	1m 41s
	56m 3s

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