Add auto baud and xTaskNotify#329

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dkerr64 wants to merge 2 commits intoplerup:mainfrom

Commits on Feb 14, 2025

Add autobaud support, copied from https://github.com/ratgdo/espsoftwareserial/tree/autobaud
dkerr64
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Add xTaskNotify() if available so FreeRTOS tasks can wait for notification rather than loop polling for received data
dkerr64
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