[Feature]: replace ::transact() with ::group()

[roxblnfk]

Is your feature request related to a problem? Please describe.

Meaning of ::transact() method may be not clear.
A programmer may think that method opens a transaction before the callable call and closes after it.
But the method just groups OPRM actions inside using EM transaction mode option. And all the custom SQL queries mill not be included in the same EM's ORM transaction.

Describe the solution you'd like

• rename ::transact() method to ::group()
• add a new ::transact() method that will open and close a transaction

Describe alternatives you've considered

No response

Additional context

No response