chore: enable strict mode

[arturovt]

No description provided.

[codecov-commenter]

Codecov Report

Merging #100 (be822cf) into master (7d0f885) will increase coverage by 0.25%.
The diff coverage is 90.00%.

@@            Coverage Diff             @@
##           master     #100      +/-   ##
==========================================
+ Coverage   86.98%   87.23%   +0.25%     
==========================================
  Files          50       50              
  Lines         553      564      +11     
  Branches       66       65       -1     
==========================================
+ Hits          481      492      +11     
  Misses         71       71              
  Partials        1        1              

Impacted Files	Coverage Δ
...ents/src/lib/lazy-elements/lazy-elements.tokens.ts	100.00% <ø> (ø)
...-element-dynamic/lazy-element-dynamic.directive.ts	54.92% <81.81%> (+4.16%)	⬆️
...zy-elements/lazy-element/lazy-element.directive.ts	85.91% <100.00%> (+1.06%)	⬆️
.../lib/lazy-elements/lazy-elements-loader.service.ts	97.93% <100.00%> (ø)

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