feat: negative value numeric validation function

[subhankarb]

Tell us about the problem you're trying to solve

As a user I want to create validation based on number of negative values

Describe the solution you’d like

Total two zero validation functions needs to be implemented:

• COUNT_NEGATIVE
• PERCENT_NEGATIVE

Example:

validations for product_db.products:

• negative value count should be less than 2:
  on: count_negative(price)
  threshold: < 2