Publish epoch interval

[rillian]

Currently the /info endpoint reports the current epoch and the timestamp of the next rotation along with the ZK public keys. It would also be nice to report the epoch rotation interval directly, instead of clients having to estimate from multiple samples. Or make assumptions.

I originally suggested we unpack the public key blob and annotate each epoch with timestamps, since that gives the server maximum flexibility. But that's an API revision, so maybe just adding an epochDuration key is good enough.

[shubrautt]

@rillian hello, I started learning about rust a few weeks ago, can I start contributing to rust projects or should I keep learning

[rillian]

Hi @shubrautt. You're welcome to submit a patch for feedback.

[shubrautt]

@rillian Thanks for replying..!!