Implement the CSV Dialect schema for the header

[dalonsoa]

Problem

Implementing the CSV Dialect schema in the header will expose the format of the tabular data before any attempt of loading it, removing any guessing work from the suer and/or the reading functions.

Possible solution

Implement the CSV Dialect as a pydantic object.

Using this schema will be done in a separate PR.

[dalonsoa]

Rather than using jsonschema here, we could use pydantic, as it is becoming more popular and we use it in other projects.