add new PureStorage FlashArray endpoints to current special agent

[sehaeg]

General information

This change makes it possible to receive more informations about PureStorage FlashArray systems than before.
https://github.com/svalabs/pure_storage_fa_extended

Proposed changes

The behavior of the Special Agent call remains unchanged. Only additional endpoints and their checks have been added.
The ruleset does not require any adjustments, as only additional endpoints and agent-based checks have been added.

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[gradecke]

@englertor not sure if you're the right person, but you look at most of the PRs so I figured I'll try. We have a company CLA that was auto detected for all previous PRs - can you see why it isn't working this time and what (if at all) we can do to solve that :)?