Add contact field to bridges

Per relay-search#40017 (closed), this commit adds the unsanitized contact parameter for bridges in Onionoo. This will then allow the field to be added to relay-search.

mentioned in merge request website!24 (merged)

assigned to @Spydar007

requested review from @hiro

added Needs Review label

Nice @Spydar007 this looks good.

closed

reopened

merged

mentioned in commit ae6b9ab1