[Solution #2] fix(core): Improve typing and support emptyOn for multi:true

[Airblader]

This change improves the type safety by not misinterpreting an array-valued parameter as a multi: true parameter.

As a side effect we can now support emptyOn for multi: true parameters.

fixes #92 fixes #27

Signed-off-by: Ingo Bürk ingo.buerk@tngtech.com

I have verified that…

• [x] the commits in this pull request follow the conventionalcommits pattern
• [x] tests have been updated or added
• [x] documentation has been updated to reflect the changes made

[codecov[bot]]

Codecov Report

Merging #105 into master will increase coverage by 0.62%. The diff coverage is 95.38%.

@@            Coverage Diff             @@
##           master     #105      +/-   ##
==========================================
+ Coverage   83.96%   84.59%   +0.62%     
==========================================
  Files          25       25              
  Lines         655      675      +20     
  Branches       99      104       +5     
==========================================
+ Hits          550      571      +21     
+ Misses         52       51       -1     
  Partials       53       53

Impacted Files	Coverage Δ
projects/ngqp/core/src/lib/serializers.ts	66.66% <ø> (-3.34%)	:arrow_down:
...re/src/lib/directives/query-param-group.service.ts	83.6% <100%> (-0.49%)	:arrow_down:
...jects/ngqp/core/src/lib/model/query-param-group.ts	98.07% <100%> (ø)	:arrow_up:
projects/ngqp/core/src/lib/model/query-param.ts	93.84% <93.54%> (+0.36%)	:arrow_up:
...s/ngqp/core/src/lib/query-param-builder.service.ts	96.66% <95.45%> (+2.54%)	:arrow_up:
...s/multi-select-control-value-accessor.directive.ts	85.71% <0%> (+2.04%)	:arrow_up:

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