[inky] Add Inky Impression 7.3" support

[fstanis]

Inky Impression 7.3" is a larger e-ink display that unlike smaller variants is based on AC073TC1A rather than UC8159.

This PR is effectively a port of pimoroni/inky#158 since the difference is primarily in the reset and update commads.

(draft until I have a chance to properly test)

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 139 lines in your changes missing coverage. Please review.

Project coverage is 45.8%. Comparing base (2cf8fa1) to head (2a24918).

Files with missing lines	Patch %	Lines
inky/impression.go	0.0%	136 Missing ⚠️
inky/types.go	0.0%	3 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main     #75     +/-   ##
=======================================
- Coverage   46.4%   45.8%   -0.6%     
=======================================
  Files         82      82             
  Lines      10031   10157    +126     
=======================================
- Hits        4658    4654      -4     
- Misses      5211    5339    +128     
- Partials     162     164      +2     

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[maruel]

I just saw the PR as it is a draft. Can you fix the linter errors? You'll need to rebase.