RFC: Deprecation of celocli identity commands

The celocli has three commands under the identity namespace

For Deprecation

identity:identifier
identity:get-attestations

Not for Deprecation
identity:withdraw-attestation-rewards

Proposal

identifier and get-attestations would be marked for deprecation and eventually removed after several months. The exact period is influenceable by feedback, which could also cause us to abort this plan. Our view is that these commands do not provide a needed interface — especially with the replacement of ASv1 with Social Connect / Federated Attestations. Whereas removing them would free up maintenance time for more useful work.

while identity:withdraw-attestation-rewards which has use for withdrawing still claimable rewards is to be kept