Fixes Pointer and Call using Serial BT callback

[SuGlider]

Description of Change

IDF has changed Serial BT Callback type definition. This PR fixes the Arduino SerialBT API to match new type and function signature.

Tests scenarios

ESP32 - CI

#include "BluetoothSerial.h"
 
BluetoothSerial SerialBT;
 
void callback(esp_spp_cb_event_t event, esp_spp_cb_param_t *param){
  if(event == ESP_SPP_SRV_OPEN_EVT){
    Serial.println("Client Connected");
  }
 
  if(event == ESP_SPP_CLOSE_EVT ){
    Serial.println("Client disconnected");
  }
}
 
void setup() {
  Serial.begin(115200);
 
  SerialBT.register_callback(callback);
 
  if(!SerialBT.begin("ESP32")){
    Serial.println("An error occurred initializing Bluetooth");
  }else{
    Serial.println("Bluetooth initialized");
  }
}
 
void loop() {}

Related links

Closes #9244

[github-actions]

	Warnings
⚠️	Some issues found for the commit messages in this PR: the commit message "SerialBT (fix): fixes the callback function pointer": summary looks empty type/action looks empty the commit message "SerialBT(fix): fixes callback pointer reference and call": type/action should start with a lowercase letter type/action should be one of [change, ci, docs, feat, fix, refactor, remove, revert, test] the commit message "Update BluetoothSerial.h": summary looks empty type/action looks empty Please fix these commit messages - here are some basic tips: follow Conventional Commits style correct format of commit message should be: <type/action>(<scope/component>): <summary>, for example fix(esp32): Fixed startup timeout issue allowed types are: change,ci,docs,feat,fix,refactor,remove,revert,test sufficiently descriptive message summary should be between 20 to 72 characters and start with upper case letter avoid Jira references in commit messages (unavailable/irrelevant for our customers) TIP: Install pre-commit hooks and run this check when committing (uses the Conventional Precommit Linter).
⚠️	The source branch "Serial_BT_Callback" incorrect format: contains uppercase letters. This can cause troubles on case-insensitive file systems (macOS). Please rename your branch.

	Messages
📖	You might consider squashing your 3 commits (simplifying branch history).

👋 Hello SuGlider, we appreciate your contribution to this project!

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