Extract telega-msg--replied-message-fetch-callback function.
This way contrib/telega-bridge-bot doesn't need to override the whole telega-msg--replied-message-fetch function.
No longer hardcode username into first name, this will allow it to support the new user title format.
This PR does:
telega-msg--replied-message-fetch-callback
function. This waycontrib/telega-bridge-bot
doesn't need to override the wholetelega-msg--replied-message-fetch
function.