Provide transaction for command explicitly

[coldacid]

I'm using ASP.NET Boilerplate (ABP) for a project and would like to use StoredProcedureEFCore with it, but since ABP has its own system for managing transactions I want to be able to pass in the database transaction it holds for the database instead of StoredProcBuilder sniffing out a transaction for itself.

[coldacid]

I have code for this locally, both adding a SetTransaction() to the stored procedure builder, and setting a particular transaction via the constructor. If either (or both) are desired, I can work out with my employer about providing the code as a PR.