Updates Meilisearch-Elixir to be compatible with Meilisearch 0.28, which otherwise has some breaking changes around faceting in Settings, as well as now enqueues most tasks (making it necessary to have a formal utility to await for Task resolution).

In summary:

• Replaces Updates module with Tasks module to reflect MS API.
• Updates documentation and tests to reflect methods that now return Tasks instead of finalized statuses.
• Updates Settings to reflect changes from facetableAttributes to filterableAttributes, and adds facet as a setting.
• Adds await_result method to Tasks module, making it part of the formal API.
• Updates config to use the new Config module.
• Updates some HTTP methods that were not interacting correctly with Meilisearch (mainly post requests -> put or patch).