Schema Validation

[yuval-hazaz]

When saving entity fields, or blocks, or pages we need to save a list of properties in a JSON field in the DB.
We should validate the JSON schema before we save it to the DB.
for example:
EntityField.Properties is a JSON field that holds the special properties for each dataType.
When data type is "Single Line Text" the properties should only include "Max Length"
When data type is "Whole Number" the properties should include "Min Value" and "Max value".

In order to do that we can use a JSON schema validation package

https://github.com/tdegrunt/jsonschema
https://github.com/ajv-validator/ajv
https://github.com/ebdrup/json-schema-benchmark

for each datatype we should have an hard-coded schema and use it both on the client side and server for validation and presentation.