Explose two callbacks in TGVE: onViewStateChange and onStateChange

[layik]

This is the first of API callbacks. Both are important for better integration of TGVE to applications and are overdue.

[codecov-commenter]

Codecov Report

Merging #164 (10fbea8) into develop (89bf78e) will decrease coverage by 0.16%. The diff coverage is 75.00%.

@@             Coverage Diff             @@
##           develop     #164      +/-   ##
===========================================
- Coverage    46.86%   46.70%   -0.17%     
===========================================
  Files           44       44              
  Lines         2375     2394      +19     
  Branches       978      989      +11     
===========================================
+ Hits          1113     1118       +5     
- Misses        1093     1102       +9     
- Partials       169      174       +5     

Flag	Coverage Δ
unittests	46.70% <75.00%> (-0.17%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/components/decksidebar/DeckSidebar.jsx	53.09% <ø> (ø)
src/utils/utils.js	51.44% <33.33%> (-2.32%)	:arrow_down:
src/home/index.js	48.00% <71.42%> (+1.65%)	:arrow_up:
src/components/settings/LayerSettings.jsx	52.83% <100.00%> (ø)
src/utils/api.js	86.88% <100.00%> (+1.17%)	:arrow_up:

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[layik]

The tests for these changes have been focused on an "OSM buildings viewer" using osmbuildings api to pull building boundaries as GeoJSON and vis them in TGVE. The throttling applied to the "update URL" might need to change but will have to wait until issues are raised.

[layik]

onStateChange is almost a reverse of what current select API does and can be seen in this PR.

[layik]

• [x] ~tests should avoid React 18 for now~
• [x] make sure when custom data is loaded it takes priority over props. So priority should be 1. URL params 2) loaded data via "add data" 3) props etc?