Feature: Add Params API

[ghost]

Summary

Some chain modules have params attached to them. It would be nice to have them displayed.

Problem Definition

Modules like governance, staking, and slashing all have params that are used within chain calcs. Create an API that pulls those params and formats them for FE usage.
Example: https://regen.aneka.io/params

Proposal

• Add gRPC clients for missing query sets
• Add mapping from param to description
  • Possibly pass this off to FE to handle there instead
• Add function to ExplorerService that pulls params from the following modules
  • cosmos
    • auth
    • bank
    • distribution
    • gov
    • mint
    • slashing
    • staking
    • ibc
      • application/transfer
      • client
  • provenance
    • attribute
    • marker
    • metadata
    • name
• Add to GeneralController to return list of params by type
  • /api/v2/params

Example response:

{
      "mint":{
        "mint_denom":"nhash",
        "inflation_rate_change":"0.130000000000000000",
        "inflation_max":"0.200000000000000000",
        "inflation_min":"0.070000000000000000",
        "goal_bonded":"0.670000000000000000",
        "blocks_per_year":"4360000"
      },
      "slashing":{
        "signed_blocks_window":"10000",
        "min_signed_per_window":"0.050000000000000000",
        "downtime_jail_duration":"600000000000",
        "slash_fraction_double_sign":"0.050000000000000000",
        "slash_fraction_downtime":"0.000100000000000000"
      },
      "staking":{
        "unbonding_time":"1814400000000000",
        "max_validators":50,
        "max_entries":7,
        "historical_entries":10000,
        "bond_denom":"nhash"
      },
      "gov":{
        "deposit":{
          "min_deposit":[
            {
              "denom":"nhash",
              "amount":"200000000"
            }
          ],
          "max_deposit_period":"1209600000000000"
        },
        "voting":{
          "voting_period":"1209600000000000"
        },
        "tallying":{
          "quorum":"0.400000000000000000",
          "threshold":"0.500000000000000000",
          "veto_threshold":"0.334000000000000000"
        }
      }
}

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For Admin Use

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