feat(template): implement rxLet template triggers

[hoebbelsB]

Description

Contextual Template States

implemented template triggers for rxLet directive

• demo
• docs (JSdocs)
• unit tests

notable changes:

template-notifier

create-template-notifier no longer has responsibility for the suspense template. Instead the Suspense notification handling was improved. create-template-notifier will now emit suspense on the following occasions:

• new observable input with a lazy or no value (if value is sync, no suspense notification is send)
  • EMPTY | NEVER included
• static undefined

template-manager

template-manager now takes over the responsibility of managing the suspense state, if it should be processed or not. If no SuspenseTemplate is provided, the first suspense notification will be ignored as this would violate with rxLets lazy template nature. All consequent suspense notifications though will cause the $suspense context variable to toggle.

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[BioPhoton]

A really nice change of responsibility!!!
Motivated to write technical docs for template Manager 😅

[edbzn]

To be honest, I'm not sure to fully understand what happens in the template manager, but there are tests and I can understand them so it looks fine!

[edbzn]

I think I screwed up the build, let me fix that