Use fastjsonschema to validate user configuration #6110
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We use jsonschema to validate user configuration upon each verdi invocation. The problem is that importing
jsonschema
package is very slow.In this PR we use the fastjsonschema instead. This package uses code generation for generating fast python code based on a given schema.
To fully take advantage of this and to avoid the compilation step, the code is pre-compiled and checked-in. The disadvantage is that when the schema changes, the code needs to be re-generated as well.