Add a way to dry run as any account

[DamianStraszak]

It seems to me that

ink-wrapper/ink-wrapper-types/src/calls.rs

Line 231 in d13339d

pub struct QueryArgs<T> {

should have one additional parameter: the contract caller. This way when dry-running one can pass any account.

[obrok]

I agree with the goal of dry-running as any account, but I think this could be achieved in a number of ways, not sure what's best for now, so I just reworded the title of the issue. In particular, the ongoing assumption was that the calling account is dependent on the connection - another option would be to have a method like as_dry_run(account_id) on the connection itself that would return a ReadOnlyConnection with the account to use baked in. TBD by person working on this issue.