Fix line burning and test rasterize against GDAL

[rafaqz]

Fixes line burning and adds some tests against gdal with :center (no line burning) and :touches (line burning).

Closes #326

@ayushpatnaikgit this should also improve the comparisons in #312 . If included an explicit test against ArchGDAL in the tests.

for a small shape, rasterize with boundary=:center is identical to GDAL. The may be some differences for larger shapes.

boundary=:touches has some disagreements with GDAL on pixel corners in the middle of lines but is pretty close after fixing this bug.

[codecov-commenter]

Codecov Report

Merging #330 (e8eeaf8) into main (81af6c6) will decrease coverage by 0.65%.
The diff coverage is 65.98%.

@@            Coverage Diff             @@
##             main     #330      +/-   ##
==========================================
- Coverage   78.82%   78.16%   -0.66%     
==========================================
  Files          38       38              
  Lines        2970     3037      +67     
==========================================
+ Hits         2341     2374      +33     
- Misses        629      663      +34     

Impacted Files	Coverage Δ
src/methods/crop_extend.jl	89.77% <ø> (ø)
src/methods/mosaic.jl	91.46% <ø> (ø)
src/methods/trim.jl	95.65% <ø> (ø)
src/sources/smap.jl	0.00% <0.00%> (ø)
src/methods/inpolygon.jl	44.31% <2.32%> (-40.47%)	⬇️
src/stack.jl	80.13% <57.14%> (-2.73%)	⬇️
src/polygon_ops.jl	79.84% <96.87%> (+1.55%)	⬆️
src/methods/mask.jl	89.09% <100.00%> (ø)
src/methods/rasterize.jl	92.22% <100.00%> (+6.17%)	⬆️
src/sources/ncdatasets.jl	82.49% <100.00%> (+0.45%)	⬆️
... and 2 more

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