make BLEMidiServer.sendMessage() public

[SunboX]

Please make the BLEMidiServer.sendMessage() method public, so we can send messages like this:

uint8_t midiMessage[] = {
    0xF0, // sysex
    0x00,
    0x21,
    0x3C,
    0x00,
    0x10,
    0x33,
    0x60,
    0x5A,
    0x00,
    0x7F,
    0xF7 // end of sysex
};
BLEMidiServer.sendMessage(midiMessage, sizeof(midiMessage));

[max22-]

Hi, sorry for replying late. it could be nice to directly have a sysex function, what do you think ? would you be interested to make a pull request ?