Add gov prop handler for updating current minter

[BrandonWeng]

Describe your changes and provide context

Adds a handler for sending proposals to update handler, will include the instructions and example prop in the docs ticket

Testing performed to validate your change

{
  "title": "Test Update Minter",
  "description": "Updating test minter",
  "minter": {
	"start_date": "2023-10-05",
        "end_date": "2023-11-22",
	"denom":	"usei",
	"total_mint_amount": 100000
  }
}

seid tx gov submit-proposal update-minter ./minter_prop.json --deposit 20sei --from admin -b block -y --gas 200000 --fees 200000usei

Before:

> seid q mint minter
denom: usei
end_date: "2023-04-30"
last_mint_amount: "333333333333"
last_mint_date: "2023-04-27"
last_mint_height: "0"
remaining_mint_amount: "666666666666"
start_date: "2023-04-27"
total_mint_amount: "999999999999"

After:

> seid q mint minter
denom: usei
end_date: "2023-11-22"
last_mint_amount: "0"
last_mint_date: ""
last_mint_height: "0"
remaining_mint_amount: "0"
start_date: "2023-10-05"
total_mint_amount: "100000"

[github-actions]

Package	Line Rate	Complexity	Health
github.com/sei-protocol/sei-chain/aclmapping/bank	83%	0	✔
github.com/sei-protocol/sei-chain/aclmapping/dex	100%	0	✔
github.com/sei-protocol/sei-chain/aclmapping/oracle	100%	0	✔
github.com/sei-protocol/sei-chain/aclmapping/staking	96%	0	✔
github.com/sei-protocol/sei-chain/aclmapping/tokenfactory	96%	0	✔
github.com/sei-protocol/sei-chain/aclmapping/utils	0%	0	❌
github.com/sei-protocol/sei-chain/aclmapping/wasm	83%	0	✔
github.com/sei-protocol/sei-chain/app	61%	0	➖
github.com/sei-protocol/sei-chain/app/antedecorators	76%	0	✔
github.com/sei-protocol/sei-chain/oracle/price-feeder/config	85%	0	✔
github.com/sei-protocol/sei-chain/oracle/price-feeder/oracle	67%	0	➖
github.com/sei-protocol/sei-chain/oracle/price-feeder/oracle/provider	49%	0	❌
github.com/sei-protocol/sei-chain/oracle/price-feeder/router/v1	45%	0	❌
github.com/sei-protocol/sei-chain/store/whitelist/cachemulti	100%	0	✔
github.com/sei-protocol/sei-chain/store/whitelist/kv	100%	0	✔
github.com/sei-protocol/sei-chain/store/whitelist/multi	100%	0	✔
github.com/sei-protocol/sei-chain/utils	59%	0	➖
github.com/sei-protocol/sei-chain/utils/datastructures	90%	0	✔
github.com/sei-protocol/sei-chain/utils/logging	100%	0	✔
github.com/sei-protocol/sei-chain/x/dex	58%	0	➖
github.com/sei-protocol/sei-chain/x/dex/cache	87%	0	✔
github.com/sei-protocol/sei-chain/x/dex/client/cli/query	22%	0	❌
github.com/sei-protocol/sei-chain/x/dex/contract	53%	0	➖
github.com/sei-protocol/sei-chain/x/dex/exchange	94%	0	✔
github.com/sei-protocol/sei-chain/x/dex/keeper	63%	0	➖
github.com/sei-protocol/sei-chain/x/dex/keeper/abci	24%	0	❌
github.com/sei-protocol/sei-chain/x/dex/keeper/msgserver	80%	0	✔
github.com/sei-protocol/sei-chain/x/dex/keeper/query	82%	0	✔
github.com/sei-protocol/sei-chain/x/dex/migrations	88%	0	✔
github.com/sei-protocol/sei-chain/x/dex/types	1%	0	❌
github.com/sei-protocol/sei-chain/x/dex/types/utils	100%	0	✔
github.com/sei-protocol/sei-chain/x/dex/types/wasm	50%	0	➖
github.com/sei-protocol/sei-chain/x/epoch	11%	0	❌
github.com/sei-protocol/sei-chain/x/epoch/keeper	66%	0	➖
github.com/sei-protocol/sei-chain/x/epoch/types	2%	0	❌
github.com/sei-protocol/sei-chain/x/mint	61%	0	➖
github.com/sei-protocol/sei-chain/x/mint/keeper	77%	0	✔
github.com/sei-protocol/sei-chain/x/mint/simulation	95%	0	✔
github.com/sei-protocol/sei-chain/x/mint/types	4%	0	❌
github.com/sei-protocol/sei-chain/x/nitro/client/cli	45%	0	❌
github.com/sei-protocol/sei-chain/x/nitro/keeper	83%	0	✔
github.com/sei-protocol/sei-chain/x/nitro/replay	63%	0	➖
github.com/sei-protocol/sei-chain/x/oracle	67%	0	➖
github.com/sei-protocol/sei-chain/x/oracle/keeper	82%	0	✔
github.com/sei-protocol/sei-chain/x/oracle/simulation	18%	0	❌
github.com/sei-protocol/sei-chain/x/oracle/types	3%	0	❌
github.com/sei-protocol/sei-chain/x/tokenfactory/keeper	85%	0	✔
github.com/sei-protocol/sei-chain/x/tokenfactory/types	2%	0	❌
Summary	15% (5347 / 35378)	0	❌

[yzang2019]

Is this documented any where else for how to make a proposal?

[BrandonWeng]

I'll add it as apart of the x/mint module readme