Add operations to run with Simulations

[alpe]

Current simulation setup does mutate the genesis state but does not provide any "WeightedOperations" (see staking)

Would be nice to have some examples to run

[alpe]

We have the basic create, instantiate, execute operations covered already.
Missing are:

• migrate
• update admin
• clear admin

and all gov proposals

There was no strong demand from the community to have more. Let's move this to some future release

[ethanfrey]

I would move this to v0.30 to trim down the v0.29 release

[GNaD13]

Hi @alpe , in the simulation for instantiate contract, I see that Admin is a random account

wasmd/x/wasm/simulation/operations.go

Line 185 in 9858034

Admin: simtypes.RandomAccounts(r, 1)[0].Address.String(),

The problem is, if Admin is a random account like that, I can't find the way to (migrate, update or clear admin) because the sender of these 3 msg must be admin.
Can you check about this?