feat(agent): Introduce labels and selectors to enable and disable plugins

[neelayu]

Summary

Attach a label to a running instance of telegraf and match it against selectors provided in the plugins. For more details, refer the linked issue

Checklist

• No AI generated code was used in this PR

Related issues

resolves #16704

[srebhan]

Let's first agree on a configuration style in the issue before reviewing...

[neelayu]

@srebhan I have implemented the spec.

One caveat is in the --select flag. The underlying library that Telegraf uses, auto parses , into multiple strings. Hence it messes up AND and OR that we defined. As a workaround I have introduced ; separator. The library also seems to be broken and does not allow us to specify the separator. urfave/cli#2066

[telegraf-tiger]

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