Update UART driver with specs, documentaion, and read/2#1508

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UncleGrumpy wants to merge 3 commits intoatomvm:release-0.6from UncleGrumpy:uart_add_timeout

+247-58

Commits on Feb 7, 2025

Update uart driver with specs, types, and function documentation
UncleGrumpy
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Commits on Feb 9, 2025