rename era2->e2ss and add contact info for era1+e2ss

[KolbyML]

@advaita-saha

So I talked with @arnetheduck and we will be renaming era2 to e2ss for 2 reasons

• so era will be reserved for Ethereum chain history whether that is EL/CL/Both
• era2 store didn't follow the era format, era refers to a period of 8192 blocks or slots, era2 was a 1 block snapshot of the state.

I also added contact info for EF Devops and me