[NEW] Direct message between multiple users (#16761)

Co-authored-by: gnidorah <gnidorah@users.noreply.github.com>
Co-authored-by: Dumitru Zavrotschi <11751017+zdumitru@users.noreply.github.com>
Co-authored-by: Sebastien Legare <slegare@gmail.com>
Co-authored-by: Diego Sampaio <chinello@gmail.com>