attach user data to bt_conn context

[fariouche]

Is your feature request related to a problem? Please describe.

Hello.
It would be nice to be able to attach a user data pointer to a bt_conn context to avoid having to set a global variable.
In my case it's to be able to set a flag from my application when it doesn't want to accept pairings. In the callback pairing_confirm for example there is only one parameter, the bt_conn.

Or maybe there is a way to do it?

Thanks!

Describe the solution you'd like

a function like bt_conn_attach_user_data or a way to pass a custom data to various callbacks

Describe alternatives you've considered

No response