Address some documentation gaps

Collection of smallish doc improvements:

[x] Document tremor-script tuple patterns (%())
[ ] Explicitly state that multiple expressions inside patterns are additive (i.e. OR logic is not supported there)
[ ] Improve example for micro-format based predicate matching inside array patterns (current example returns an empty array result. document examples like this with output as well, for improved clarity).
[ ] Usage example for config preprocessor directive, with link to enabling pipeline metrics collection for monitoring
[ ] Update monitoring example, including section on enriching (old script code, pipeline yaml to trickle)
[ ] Remove pipeline yaml in use in other docs like https://docs.tremor.rs/operations/configuration/
[ ] Document ability to create custom pipeline inputs/outputs for trickle (interfaces in old pipeline yaml). examples like: select event from in into out/route1, which allows use of route1 as the port for binding the pipeline to another artefact
[ ] Document config file for new tremor cli (~/.tremor/config.yaml)
[x] Document the interval unit (nanoseconds) for tremor-query window definitions, for when folks want to construct it outside of datetime functions (which requires use of core prefix right now)
[ ] Document , as separator for multiple expressions in a case block

tremor-rs / tremor-runtime