Display SSH Key Fingerprint in key listing UI (BB-10208)

I would find it convenient if the list of SSH keys in account management displayed the respective fingerprints as well. (the output of ssh-keygen -l -f keyfile)

When trying to match which of my many private keys were paired with the public portions in BitBucket, I had to look at the actual content of the public key in BitBucket's interface and compare the lengthy strings or compute the fingerprints myself.

The process would have been a lot simpler if the interface displayed the fingerprints.