refactor: unsubscribe on destroy

[drumonii]

Please read and mark the following check list before creating a pull request:

• I read and followed the CONTRIBUTING.md guide.
• I read and followed the New Feature Checklist guide.

Short description of what this resolves:

• Add https://github.com/cartant/rxjs-tslint-rules package
• Enable the https://github.com/cartant/rxjs-tslint-rules#rxjs-no-unsafe-takeuntil rule using the default configuration
• Convert usages of takeWhile(() => this.alive) to lastly piped takeUntil(this.destroy$) with destroy$ defined as new Subject<void>() that is completed in the ngOnDestroy:

    this.destroy$.next();
    this.destroy$.complete();

Resolves #1059

[codecov]

Codecov Report

Merging #2112 into master will increase coverage by 0.12%.
The diff coverage is 82.52%.

@@            Coverage Diff            @@
##           master   #2112      +/-   ##
=========================================
+ Coverage   84.58%   84.7%   +0.12%     
=========================================
  Files         235     235              
  Lines        8061    8042      -19     
  Branches      710     710              
=========================================
- Hits         6818    6812       -6     
+ Misses       1023    1010      -13     
  Partials      220     220

Impacted Files	Coverage Δ
...rk/theme/components/cdk/overlay/overlay-trigger.ts	96.59% <ø> (ø)	⬆️
.../framework/theme/components/menu/menu.component.ts	77.86% <100%> (+1.06%)	⬆️
.../components/cdk/overlay/dynamic/dynamic-overlay.ts	99.11% <100%> (-0.01%)	⬇️
.../theme/components/tree-grid/tree-grid.component.ts	75.92% <100%> (+0.92%)	⬆️
...rk/theme/components/radio/radio-group.component.ts	87.23% <100%> (+0.77%)	⬆️
...k/theme/components/list/infinite-list.directive.ts	91.66% <100%> (+1.5%)	⬆️
...mework/theme/components/layout/layout.component.ts	74.48% <100%> (-0.52%)	⬇️
.../theme/components/select/option-group.component.ts	96.66% <100%> (+0.11%)	⬆️
.../components/context-menu/context-menu.directive.ts	92.15% <100%> (+1.96%)	⬆️
...mework/theme/components/select/select.component.ts	91% <100%> (+0.29%)	⬆️
... and 12 more

[yggg]

Thanks a lot @drumonii 🥇