[Bridge] Add function isBridgeName
[Bridge] Add function isBridgeName

This function returns true if the provided name is a valid
bridge name.

simonbru/rss-bridge,Riduidel/rss-bridge,ORelio/rss-bridge,RSS-Bridge/rss-bridge,Frenzie/rss-bridge,Riduidel/rss-bridge,ORelio/rss-bridge,RSS-Bridge/rss-bridge,kranack/rss-bridge,simonbru/rss-bridge,kranack/rss-bridge,ORelio/rss-bridge,kranack/rss-bridge,sebsauvage/rss-bridge,RSS-Bridge/rss-bridge,kranack/rss-bridge,Frenzie/rss-bridge,Riduidel/rss-bridge