Add types aliases

[Taztingo]

Summary

It would be very helpful to have typed aliases in our provwasm-std. I noticed a lot of projects define these to make it easier to read and write contracts.

Problem Definition

It can be difficult for new contract developers to know what the correct types are in a provwasm contract. It can also confuse people who are newer to Rust.

Proposal

Create the following four type aliases in provwasm-std so that every project can make use of them:

pub type ProvDeps<'a> = Deps<'a, ProvenanceQuery>;
pub type ProvDepsMut<'a> = DepsMut<'a, ProvenanceQuery>;
pub type ProvTxResponse = Result<Response<ProvenanceMsg>, ContractError>;
pub type ProvQueryResponse = Result<Binary, ContractError>;

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[kwtalley]

Definitely agree with this and will see how to incorporate it with the major rewrite to use protos in #101 in progress