Add time to simulation ctx

[fkneeland-figure]

Summary of Bug

When running simulation tests with wasmd I am running into this error: https://github.com/CosmWasm/wasmd/blob/14e58bfa81ea2ade0ff00ebd067ac0bc75e37cf8/x/wasm/types/types.go#L258

This is because when we are running in simulation mode we don't populate the BlockTime field on the ctx:

cosmos-sdk/baseapp/baseapp.go

Line 361 in bc3cda6

ctx: sdk.NewContext(ms, header, true, app.logger).WithMinGasPrices(app.minGasPrices),

and

cosmos-sdk/baseapp/baseapp.go

Line 500 in bc3cda6

ctx, _ = ctx.CacheContext()

Version

Steps to Reproduce

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