Feature/v0.7

[jonasteuwen]

Updates to version v0.7

• deprecate internal_handler in favor of vips
• Increase test coverage

See also #244

[codecov]

Codecov Report

Attention: Patch coverage is 90.90909% with 4 lines in your changes missing coverage. Please review.

Project coverage is 88.08%. Comparing base (1f05317) to head (ca6697b).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
dlup/_image.py	80.00%	2 Missing ⚠️
tests/backends/test_backends.py	90.47%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #243      +/-   ##
==========================================
- Coverage   89.84%   88.08%   -1.76%     
==========================================
  Files          38       25      -13     
  Lines        3101     2266     -835     
==========================================
- Hits         2786     1996     -790     
+ Misses        315      270      -45     

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