Add tenure-height to block height info on the explorer

[314159265359879]

Please review the existing enhancement issues at the link below before creating a new one to ensure you do not create a duplicate request.

With the Nakamoto release "tenure-height" is introduced but this is not revealed in the explorer, right? should confirmations have three "block heights" instead: Stacks block height > tenure-height > bitcoin block height Tenure-height will be important for users to know when their BNS names expire and any other protocols that rely on "old block-height", I don't think this is revealed anywhere yet.

Is your feature request related to a problem? Please describe. Users will want to know when their BNS names expire they will use "tenure-height"

https://forum.stacks.org/t/bns-nakamoto-upgrade/15579/4

Describe the solution you'd like Have three "block heights" instead: Stacks block height > tenure-height > bitcoin block height

Describe alternatives you've considered n.a.

Additional context Brice also likes this idea.