refactor(terminal): extract types to files

[joshka]

Fields on Frame that were private are now pub(crate).

[codecov]

Codecov Report

Attention: 31 lines in your changes are missing coverage. Please review.

Comparison is base (e64e194) 92.3% compared to head (70d43ff) 92.3%.

Files	Patch %	Lines
src/terminal/terminal.rs	90.9%	22 Missing ⚠️
src/terminal/frame.rs	65.2%	8 Missing ⚠️
src/terminal/viewport.rs	93.7%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##            main    #760   +/-   ##
=====================================
  Coverage   92.3%   92.3%           
=====================================
  Files         55      57    +2     
  Lines      14840   14840           
=====================================
  Hits       13703   13703           
  Misses      1137    1137           

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