Add the number of errors per resource to the csv

[a-berish]

When a resource has many missing fields, it would be useful to know how many required fields are missing.

To do this, we should add the number of validation errors to a column in the .csv

• Add the number of validation errors, as an integer, to the dictionary that is created inside the validator.py
• Make sure this new column is reflected in field names listed in the reporter.py