Support for non-retryable transactions

[steve-chavez]

Currently hasql-transaction retries infinitely on code 40001 , this causes problems on replicas as mentioned on PostgREST/postgrest#3673.

Would it be possible to make the retrying behavior on both 40001 and 40P01 optional?

This is done here

hasql-transaction/library/Hasql/Transaction/Private/Sessions.hs

Lines 48 to 49 in 2a9a710

	"40001" -> onTransactionError
	"40P01" -> onTransactionError

[nikita-volkov]

I guess the functions that execute transactions can be parameterized with a configuration of how error codes should be handled. PR is welcome