Add string constructor and concat routines taking explicit length args #5586
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Summary
Applies the upstream changes here: arduino/ArduinoCore-API@3b88acac8^...0d83f1a
Impact
Adds new String convenience methods that are now available in the mainline Arduino implementation, simplifying interoperability with C code that uses pointer+length strings rather than 0-termination. Also includes a change to avoid mutating the source string when taking a substring.