Mezon PHP Crud Model Service: Model execute CRUD operations on database records

This class implements a model execute CRUD operations on database records.

It extends database model service class to implement functions that run queries to manipulate database records to perform the CRUD operations. Currently it can:

- Get the new records since a given date
- Get the amount of records in a table
- Get the records that match a condition
- Get the count of records that match a condition
- Get records with given identifier numbers
- Get the count of records grouped by given field values
- Delete records that match a condition
- Update records that match a condition
- Insert new records with given values