Check that URLs are valid using `format: uri`

[GraemeWatt]

The ATLAS record ins2762099 contains:

additional_resources:
- {description: web page with auxiliary material, location: 'https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2020-01
    :2024'}

in the submitted submission.yaml file, which appears in the JSON format as:

"resources":[{"description":"web page with auxiliary material","type":"html","url":"https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2020-01 :2024"}]

The INSPIRE schema requires URLs to be well-formed using format: uri, creating problems when HEPData metadata with invalid URLs is harvested by INSPIRE. The HEPData JSON schema should be made more strict using format: uri for fields corresponding to URLs, namely, the location in additional_resources_schema.json (only if the location starts with http, since this field is also used for a local resource file), the url of a license in additional_resources_schema.json, the url of a data_license in submission_schema.json, and the data_schema in submission_schema.json.

See Validating Formats for help with the implementation. Note that additional dependencies need to be installed with pip install jsonschema[format] and an argument format_checker=jsonschema.FormatChecker() needs to be passed to the jsonschema.validate function.