Add support for BDD style expectations

[Nokel81]

Proposal

Add support for blocking on consuming expectations until an expectation has been declared. Internally it would use a channel instead of an array of expectations. It would also imply MatchExpectationsInOrder.

var mock sqlmock.Sqlmock

...

mock.BlockExpectationsUntilExpected(true)

Use-cases

This is for BDD style testing where most of the configurations of expectations are done sequentially in BeforeEach's (such as from "github.com/onsi/ginkgo/v2") and then the individual tests are each very small with a single Expect call

[hiSandog]

Would BDD-style expectations be an alternate syntax over the existing matcher and expectation engine, or introduce different ordering and failure semantics? Keeping both styles on the same underlying behavior would reduce the risk that equivalent tests report mismatches differently.