Add support for new features in GEOS 3.10

[paleolimbot]

• [x] GEOSDistanceWithin, GEOSPreparedDistanceWithin
• [x] GEOSDensify
• [x] GEOSMakeValidWithParams
• [x] GEOSWKBWriter_getFlavor, GEOSWKBWriter_setFlavor
• [x] GEOSConstrainedDelaunayTriangulation
• [x] GEOJSON IO

[codecov-commenter]

Codecov Report

Merging #57 (1c80196) into master (9d6ada0) will decrease coverage by 1.72%. The diff coverage is 42.66%.

@@            Coverage Diff             @@
##           master      #57      +/-   ##
==========================================
- Coverage   98.94%   97.21%   -1.73%     
==========================================
  Files          31       31              
  Lines        2376     2445      +69     
==========================================
+ Hits         2351     2377      +26     
- Misses         25       68      +43     

Impacted Files	Coverage Δ
R/geos-binary-atomic.R	94.87% <0.00%> (-5.13%)	:arrow_down:
src/geos-binary-atomic.c	94.54% <0.00%> (-3.57%)	:arrow_down:
src/init.c	100.00% <ø> (ø)
src/geos-io.c	88.71% <40.74%> (-7.78%)	:arrow_down:
src/geos-unary-geometry.c	96.36% <50.00%> (-2.68%)	:arrow_down:
R/geos-io.R	85.71% <54.54%> (-14.29%)	:arrow_down:
R/geos-unary-geometry.R	97.05% <60.00%> (-2.95%)	:arrow_down:

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[mdsumner]

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