[POC] feat: add filters for roles management (1st approach)

[mariajgrimaldi]

Description

This PR adds filters aimed to be used for roles management in the main openedx services. Here's is an example of how they can be used:

They might be triggered by:
openedx/edx-platform@master...MJG/roles-refactor-by-filters

And with the following pipeline steps, we can add an additional role implemented in a plugin:
mariajgrimaldi/platform-plugin-sample@13a20ac

Configured using this Django setting:

OPEN_EDX_FILTERS_CONFIG = {
    "org.openedx.learning.instructor.dashboard.render.started.v1": {
        "fail_silently": False,
        "pipeline": [
            "platform_plugin_sample.extensions.filters.CheckProfessorRole",
        ]
    },

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[mphilbrick211]

Hi @mariajgrimaldi! Just checking in to see if this is still needed?

[mariajgrimaldi]

@mphilbrick211: thanks for the reminder! I'll close this for the time being