[zscaler_zpa] Add ZScaler ZPA package.#2458

Merged

andrewkroh merged 6 commits intoelastic:mainfrom

vinit-chauhan:package_zscaler_zpa

Feb 14, 2022

Commits on Jan 3, 2022

Initial commit for zscaler zpa
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Commits on Jan 17, 2022

- Updated documentation.
vinit-chauhan
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Commits on Jan 21, 2022

Removed json formating form non json fields in user guide.
vinit-chauhan
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Commits on Feb 7, 2022

- Changed observer.ip to array
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Commits on Feb 10, 2022

Added newline at the end of files.
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Commits on Feb 14, 2022

Updated ports and configuration parameter name.
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