Add support for easybuild packages

Package list: https://docs.easybuild.io/version-specific/supported-software/

Data: https://github.com/easybuilders/easybuild-easyconfigs

cc @boegel

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Start by reviewing the EasyBuild supported-software list and the easybuilders/easybuild-easyconfigs data linked in the issue. Identify how package sources are represented in this repository and define completion as the service exposing metadata for the supported EasyBuild packages.

Written by the indexing model from the issue text.