Form for creating a new schema

[dcl10]

Description

Create a form that can build a json object like this and send to the backend to be added to the database. The form should be able to create an arbitrary number of columns and their test conditions. A column may have more than one test condition. The form must also supply a unique name for the schema.

Tasks

• [x] Page where the form will live
• [x] Component for columns
  • [x] column name
  • [x] column data type
  • [x] column check
• [x] Component for checks
• [x] Get valid checks from backend
• [x] Get valid dtypes from backend
• [x] submit to endpoint