Add transport information in boot logs related to bridges
When a Tor client boots with bridges enabled, it spits out some logs related to those bridges:
[Notice] Learned fingerprint 844B1F53FFD548C998F8D3B01B7E19FA07C32222 for bridge 1.2.3.4:5678
[Notice] new bridge descriptor 'bla' (fresh): $844B1F53FFD548C998F8D3B01B7E19FA07C2222~bla at 1.2.3.4
In use cases where we have multiple bridges using multiple pluggable transports, it would be nice if those log messages also mentioned pluggable transport information.