snapshot_94

TVI-2895  - sampler native backend (#8)

* move template var replacement partially to backend

* improved template composition

* cookie values forwarded via query

* updated ci setup

* create snapshot releases from PR

* fix template processing

* improved tc check

* added JSON ponyfills

* improved handling of query params

* set percentile overrules tech cookie validation

* simplified isIframeCapable method

* improved test initialization

* simplified backend

* fix test setup

* dependencies update