add PtrSink for unsafe

[codecov[bot]]

Codecov Report

Merging #91 (0992b67) into main (9b8a385) will decrease coverage by 0.57%. The diff coverage is 96.52%.

@@            Coverage Diff             @@
##             main      #91      +/-   ##
==========================================
- Coverage   90.70%   90.14%   -0.57%     
==========================================
  Files          11       11              
  Lines        2120     2161      +41     
==========================================
+ Hits         1923     1948      +25     
- Misses        197      213      +16     

Impacted Files	Coverage Δ
src/lib.rs	100.00% <ø> (ø)
src/block/decompress_safe.rs	98.34% <88.88%> (ø)
src/sink.rs	97.52% <94.00%> (-2.48%)	:arrow_down:
src/block/decompress.rs	94.44% <94.11%> (-1.03%)	:arrow_down:
src/block/compress.rs	98.11% <100.00%> (-1.71%)	:arrow_down:
src/frame/compress.rs	83.62% <100.00%> (ø)
src/frame/decompress.rs	75.97% <100.00%> (ø)

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