Implement the database table eraser SQL scripts

[szdezso]

AC-01 Collect SQL scripts to empty data tables in azure sql database

AC-02 Document it on the github as codebase

[C-63]

@szdezso

delete from TruckCompanyToDelivery
delete from CustomerToDelivery

delete from Transactions

delete from Documents
delete from Entities
delete from Interfaces
delete from Points
delete from TruckCompanies

TransactionStatuses is not emptied because it's seeded by the db creation script.

[szdezso]

@C-63 I thought that you will add the sql scripts to the soruce code under a folder.