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* add "getBattery" functions + #define simplicity

replaced all function protections with a #define to simplify code functionality.  Also added "getBattery" functions to leverage "esp_modem_get_battery_status" call in ESP-MODEM.

* add "getBattery" function defs to PPP.h

* fix(ppp): uncomment error logging, change new function naming

* fix(ppp): rename new functions for naming conformity

* ci(pre-commit): Apply automatic fixes

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Co-authored-by: pre-commit-ci-lite[bot] <117423508+pre-commit-ci-lite[bot]@users.noreply.github.com>