feat: add support for symbol elevation (#7827)

* Add support for symbol elevation.

* Pass down evelation offset.

* rename method.

* Fix elevation above the horizing on terrain missing.

* Update package-lock

* Add missing image, fix example date and name

* Fix date.

* Keep symbol visible if elevated symbol is line-of-sight (#8164)

* keep symbol visible if elevated symbol is line-of-sight

* adjust pitch a bit

* Increase elevated symbol render test timeout

* Update build size

* Update solution to include anchor

* Update lint

* Remove test

* Fix build

* Update test

* Added missing category

* Update test data

* Fix test

* Do not wrap get elevation

* Improve types

* make elevation defition isnstead of a file.

* Move type to a different place.

* Fix bad addition

* Improve getElevation initialization and types.

* Improve coverage and test readablilty.

* Use latest version of style spec

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Co-authored-by: Birk Skyum <74932975+birkskyum@users.noreply.github.com>