Change the interface of tiffcomposite_int.hpp to use size_t

[kevinbackhouse]

A lot of these values are file offsets, so I think it's cleaner to use size_t. Overall, it reduces the number of static_casts.

[codecov]

Codecov Report

Merging #2400 (1992ae3) into main (62705a6) will decrease coverage by 0.12%.
The diff coverage is 92.80%.

@@            Coverage Diff             @@
##             main    #2400      +/-   ##
==========================================
- Coverage   64.40%   64.28%   -0.13%     
==========================================
  Files         119      119              
  Lines       21087    21135      +48     
  Branches    10397    10430      +33     
==========================================
+ Hits        13582    13586       +4     
- Misses       5355     5400      +45     
+ Partials     2150     2149       -1     

Impacted Files	Coverage Δ
src/makernote_int.hpp	92.30% <ø> (ø)
src/tiffvisitor_int.cpp	79.78% <69.23%> (ø)
src/makernote_int.cpp	66.34% <87.50%> (ø)
src/tiffcomposite_int.cpp	75.99% <95.83%> (-0.03%)	⬇️
src/convert.cpp	51.40% <100.00%> (ø)
src/tiffcomposite_int.hpp	92.72% <100.00%> (ø)
src/tiffimage_int.cpp	79.58% <100.00%> (ø)
src/tiffvisitor_int.hpp	100.00% <100.00%> (ø)
src/bmffimage.cpp	68.26% <0.00%> (-7.49%)	⬇️
src/xmp.cpp	76.54% <0.00%> (ø)
... and 6 more

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[piponazo]

LGTM!