fix(overlay-trigger): performance lag after repeat in loop

[evtkhvch]

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• [x] I read and followed the CONTRIBUTING.md guide.
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Short description of what this resolves:

Closes #1467

• reduce memory usage in NbClickTriggerStrategy and NbFocusTriggerStrategy

ISSUE: NbTriggerStrategyBase doesn't work as expected. It should fire hide$ when document is clicked.

[yarrysmod]

any updates on this PR?

[EFritzsche90]

Some update on this? Performance within a loop is really hell. :D

[arpansac]

Anyone still working on this? We need it quite urgent 😃

[arpansac]

Can we implement a wrapper library over Nebular and create our own overlay component to patch this? I'm thinking that this is the only way right now.