Add metadata for `spn` in `bank`

[lumtis]

atom metadata on the hub:

metadatas:
- base: uatom
  denom_units:
  - aliases:
    - microatom
    denom: uatom
    exponent: 0
  - aliases:
    - milliatom
    denom: matom
    exponent: 3
  - aliases: []
    denom: atom
    exponent: 6
  description: The native staking token of the Cosmos Hub.
  display: atom
  name: ""
  symbol: ""

We should implement the same with spn/mspn/uspn

[aljo242]

The main mechanism for setting DenomMetadata is through the x/bank genesis as seen here.

So, we just need to add this metadata to our template and final genesis for mainnet. Are we able to add this with the existing template (config.yml)?

[lumtis]

Yes you can define any genesis state from config.yml

[lumtis]

Hey @aljo242, anything new on this one?

Front-end team might need it

[aljo242]

Ah, I thought this was less urgent so I just started working on the claim module. I'll do this PR soon.

[lumtis]

I wasn't aware until recently