Feature: Add API for validator economics

[ghost]

Summary

Add an API to return data used to calculate validator economics

Problem Definition

Validator economics are important to show the viability and returns a validator can make over time. See here. Per the request, we should add an API to return the necessary data for those calculations.

Proposal

Add API that returns:

• total # of validators
• Per validator
  • self bonded
  • delegator bonded
  • total bonded
  • bonded percentages
  • commission rate
  • block proposer fee amount (verify
  • Last updated date ←--- Will require db change
• Daily volume amounts
  • Fee
  • gas used
  • gas wanted
• gas fee factor (have ira make grpc to return that) - validator specific

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For Admin Use

• Not duplicate issue
• Appropriate labels applied
• Appropriate contributors tagged
• Contributor assigned/self-assigned