Macro `str_` conflicts with third party libraries

[bblanchon]

https://github.com/RAKWireless/RAK-APOLLO3-RUI/blob/0e6e009193fb5eff9bb486cdf46e0a6272984e6f/cores/apollo3/component/service/mode/cli/atcmd_queue.h#L21C1-L21C1

This macro conflicts with ArduinoJson (bblanchon/ArduinoJson#1978).

Please use a naming convention that doesn't clash with standard C++ practices.
For example, use ALL_CAPS, as recommended in the Core Guidelines.