remove x/params

[dimiandre]

Many modules we have still depend on x/params

We should remove all references to it and implement their own params store for each module.

an example on how to do is here cosmos/cosmos-sdk#12363

[dimiandre]

another place to take inspiration from

ef6bc6b

[reecepbcups]

Thanks! Yea I was hoping to have this done in my cleanup branch this week. got pushed back for the v15 upgrade though

that + the migration is the last major milestone left other than adding more ictest & shipping

[reecepbcups]

Completed in other merged PRs for each module