[Solution #1] 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. We also introduce a new MultiQueryParam type as a shortcut.

As a side effect, we move the evaluation of (de-)serializing entirely to the service and can thus 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 #102 into master will decrease coverage by 0.11%. The diff coverage is 89.47%.

@@            Coverage Diff             @@
##           master     #102      +/-   ##
==========================================
- Coverage   83.96%   83.85%   -0.12%     
==========================================
  Files          25       25              
  Lines         655      675      +20     
  Branches       99      105       +6     
==========================================
+ Hits          550      566      +16     
- Misses         52       54       +2     
- Partials       53       55       +2

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	82.85% <85.71%> (-1.24%)	:arrow_down:
projects/ngqp/core/src/lib/model/query-param.ts	91.48% <85.71%> (-1.99%)	:arrow_down:
...s/ngqp/core/src/lib/query-param-builder.service.ts	96.66% <95.45%> (+2.54%)	:arrow_up:

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[alexey-anufriev]

Looking forward to having this merged.

[Airblader]

Closing in favor of #105