Add pages option

[opatiny]

• refactor: remove I for interface and export TiffIfd
• feat: add pages options

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1e543c8) 79.18% compared to head (462bf5c) 79.89%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #47      +/-   ##
==========================================
+ Coverage   79.18%   79.89%   +0.70%     
==========================================
  Files          12       12              
  Lines         543      562      +19     
  Branches      102      110       +8     
==========================================
+ Hits          430      449      +19     
  Misses        106      106              
  Partials        7        7              

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[targos]

• We should throw if pages contains invalid indexes (including out of range wrt the file being decoded)
• We should not decode images that will be discarded. You can use the same trick as pageCount getter to skip decoding images.