Fixes Serial Example and Adds a new std:func Serial Example #8409
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Description of Change
This PR fixes a misplaced example (Serial_All_CPU_Freqs.ino) to add it to the necessary folder with the same name in order to have it available in the example list in the Arduino IDE.
The PR also adds a new example that demonstrates using std::function for HardwareSerial::onReceive().
It also demonstrates using a single general callback function for any Serial port, using a lambda function.
Tests scenarios
Tested using ESP32 and ESP32-S3 with all 3 UARTs and also using USB CDC enaled.
Related links
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