feat: Nats Jetstream consumer #11046 add simple support for jetstream subjects

[b3rtram]

Required for all PRs:

• [ x] Updated associated README.md.
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resolves #11046

Changed nats_consumer input plugin. Added a new configuration element js_subjects where a user can add the subjects to subscribe with jetstream context. If the length of the js_subjects_array is zero it will ignored. js_subject is optional, the original subject is not optional, so there are no breaking changes.
Because there is no interface in go nats consumer I could not reuse nats.Conn, I need to add a new jsConn variable and copy code :(

This is my first github code contribution. Please be patient and give me feedback

[srebhan]

Hey @b3rtram and thanks for the nice contribution! I have some smaller comments in the code. Can you please take a look?

[srebhan]

The code looks good to me. I'd nevertheless like to ask you for a few more words in the README to help new/inexperienced users to find their way...

[srebhan]

Perfect! Thanks @b3rtram!

[telegraf-tiger]

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s390x.deb		linux_i386.tar.gz
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