feat: [FC-86] implement multivalue faceted search using Meilisearch

[Serj-N]

Add logic to MeilisearchEngine to support filtering courses by multiple options within a single facet category.

• The changes are made in the meilisearch module, with one exception being api.course_discovery_search to make integration testing possible at this stage of development.
• Added unit tests and integration tests.
• A make command is added to make it easy to run tests in a docker container.

[openedx-webhooks]

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[e0d]

@Serj-N
I've added you to the openedx-triage team as you are covered under an entity CLA. This will mean that tests will run automatically when you submit a pull request in the future. Please look for an invitation in your email and accept it.

[Serj-N]

@e0d Hello and thank you! Invitation accepted

[e0d]

@Serj-N It looks like there are some failed checks, please have a look.