feat(core): added clearOnDestroy

[Airblader]

When set, the query params managed by the QueryParamGroup are cleared from the URL when the directive binding this group goes out of scope.

fixes #172

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

This pull request relates to or closes the following issues:

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

[ghost]

DeepCode's analysis on #93d056 found:

• :information_source: 2 minor issues. :point_down:

  Top issues

Description	Example fixes
'public' is implicit. Occurrences: query-param-group.ts:29 query-param-group.ts:35 query-param-group.ts:38	:wrench: Example fixes
No catch method for promise. This may result in an unhandled promise rejection. Occurrences: query-param-group.service.ts:86	:wrench: Example fixes

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[codecov[bot]]

Codecov Report

Merging #174 into master will increase coverage by 0.03%. The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master     #174      +/-   ##
==========================================
+ Coverage   84.00%   84.04%   +0.03%     
==========================================
  Files          25       25              
  Lines         744      752       +8     
  Branches      118      119       +1     
==========================================
+ Hits          625      632       +7     
  Misses         60       60              
- Partials       59       60       +1     

Impacted Files	Coverage Δ
...re/src/lib/directives/query-param-group.service.ts	84.37% <77.77%> (+0.06%)	:arrow_up:
...jects/ngqp/core/src/lib/model/query-param-group.ts	98.18% <100.00%> (+0.03%)	:arrow_up:
...s/ngqp/core/src/lib/query-param-builder.service.ts	96.87% <100.00%> (ø)

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