Allow URLs for `kcl import` paths

[tvandinther]

Feature Request

Is your feature request related to a problem? Please describe:
When importing KCL from a jsonschema using a command such as kcl import -m jsonschema [FILE] I often want to use a jsonschema defined in some remote git repo. To do this, I need to first download the file locally and then run the import command.

Describe the feature you'd like:
I would like to be able to specify a url to fetch the raw text from such as a raw github URL to prevent the step of downloading it myself.

Describe alternatives you've considered:
Downloading the file first.

Teachability, Documentation, Adoption, Migration Strategy:
This would be particularly useful for introducing people to KCL in quick starts and tutorials, as well as making it easier to script this flow.