Added Support for ELV-BM-TRX1

[ELV-Elektronik-AG]

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Summary

This PR fixes/implements the following bugs/features

• [ ] Added Support for the ELV-BM-TRX1

The ELV Modular System is a great fit for the stm32duino library

Validation

Github Actions have passed, a working sketch is

#include "STM32LowPower.h"

void setup() {
  pinMode(LED_BUILTIN, OUTPUT);
  // Configure low power
  LowPower.begin();
}

void loop() {
  digitalWrite(LED_BUILTIN, HIGH);
  LowPower.deepSleep(1000);
  digitalWrite(LED_BUILTIN, LOW);
  LowPower.deepSleep(1000);
}