x-pack/filebeat/input/entityanalytics/provider/azuread/fetcher/graph: add support for user-defined query selection

[efd6]

Proposed commit message

The $select optional queries were previously hardcoded. Make these accessible via a configuration group at the root level.

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• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
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[bhapas]

LGTM otherwise