Use flat data structure to store lists of points

[jush]

The main difference is the introduction of FlattenListOfPoints which is able to store a list of coordinate points (latitude, longitude, altitude, bounding box) as a collection of arrays.

Also avoid using List<Point> and instead use double [] to avoid extra memory use.

This change improves memory usage significantly:

Before: using List	After: using double []
3M points LineString take 286,1MB	3M points LineString take 45,8MB

It also unlocks the possibility to use JNI#GetArrayElements to access the array in one JNI call.

I have deprecated the LineString#coordinates() and Point#coordinates(). They can still be used but let's encourage the use of the flat structure or direct calls to longitude(), latitude(), altitude() in case of Point.

To avoid breaking things a new interface FlattenedCoordinateContainer is added to support the new flattenCoordinates() method used in serialization code that inherits from the already existing CoordinateContainer.
BaseGeometryTypeAdapter is modified to support this new container (method writeFlattenedCoordinateContainer()).

Also the unit tests are extended to cover the new logic plus improve older tests.

[codecov]

Codecov Report

❌ Patch coverage is 81.87500% with 58 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.19%. Comparing base (5eddaf6) to head (164c42d).

Files with missing lines	Patch %	Lines
...n/src/main/java/com/mapbox/geojson/LineString.java	64.86%	7 Missing and 6 partials ⚠️
...mapbox/geojson/FlattenListOfPointsTypeAdapter.java	83.07%	6 Missing and 5 partials ⚠️
...com/mapbox/geojson/BaseCoordinatesTypeAdapter.java	54.54%	7 Missing and 3 partials ⚠️
...eojson/src/main/java/com/mapbox/geojson/Point.java	64.00%	4 Missing and 5 partials ⚠️
...va/com/mapbox/geojson/BaseGeometryTypeAdapter.java	65.00%	4 Missing and 3 partials ⚠️
...n/src/main/java/com/mapbox/geojson/MultiPoint.java	58.82%	2 Missing and 5 partials ⚠️
...n/java/com/mapbox/geojson/FlattenListOfPoints.java	98.79%	0 Missing and 1 partial ⚠️

@@             Coverage Diff              @@
##               main    #1630      +/-   ##
============================================
+ Coverage     78.08%   79.19%   +1.11%     
- Complexity     1070     1128      +58     
============================================
  Files           161      162       +1     
  Lines          4508     4697     +189     
  Branches        626      660      +34     
============================================
+ Hits           3520     3720     +200     
+ Misses          719      707      -12     
- Partials        269      270       +1     

Files with missing lines	Coverage Δ
...x/geojson/ListOfDoublesCoordinatesTypeAdapter.java	100.00% <100.00%> (ø)
.../main/java/com/mapbox/geojson/MultiLineString.java	57.74% <ø> (ø)
...src/main/java/com/mapbox/geojson/MultiPolygon.java	55.40% <ø> (ø)
...json/src/main/java/com/mapbox/geojson/Polygon.java	73.07% <ø> (ø)
...pbox/geojson/shifter/CoordinateShifterManager.java	100.00% <100.00%> (+15.38%)	⬆️
...n/java/com/mapbox/geojson/utils/PolylineUtils.java	84.86% <100.00%> (+6.36%)	⬆️
...n/java/com/mapbox/geojson/FlattenListOfPoints.java	98.79% <98.79%> (ø)
...va/com/mapbox/geojson/BaseGeometryTypeAdapter.java	67.53% <65.00%> (-0.12%)	⬇️
...n/src/main/java/com/mapbox/geojson/MultiPoint.java	66.66% <58.82%> (+14.58%)	⬆️
...eojson/src/main/java/com/mapbox/geojson/Point.java	70.31% <64.00%> (+1.46%)	⬆️
... and 3 more

... and 1 file with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[jush]

This is a copy paste of above public static List<Point> decode(..) except that it internally uses arrays of doubles that grow (doubles in size) as needed.