Added onDisconnect with gatt parameters to BLEServerCallbacks, equivalent to the existing onConnect

[RM-Alltrons]

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Description of Change

This change adds a onDisconnect with parameters to BLEServerCallbacks, equivalent to onDisconnect, which allows the code to know which (of the multiple connections) is disconnecting. Similar to how onConnect can be used with esp_ble_gatts_cb_param_t now.

Tests scenarios

Tested on ESP32-S3-DevKitC-1, Platform-IO 5.1.1 (framework=Arduino), while connecting with 2 BLE devices (android and ios) simultaneous, reconnecting them one at a time.

Related links

Closes #6008

[CLAassistant]

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[me-no-dev]

@RM-Alltrons could you please sign the CLA so we can merge your changes?

[RM-Alltrons]

@RM-Alltrons could you please sign the CLA so we can merge your changes?
When I pushed, I tried signing a few times, but that did not seem to work.
I now tried a different browser, it says that "You have agreed to the CLA for espressif/arduino-esp32", but CLA-batch does not confirm that.

[me-no-dev]

@RM-Alltrons I guess your local github settings cause you to commit as "Admin" which is not your username and that causes the problem. I will merge it anyway :) Thanks!