use log10 for zero padding tiffs

[alessandrofelder]

Description

What is this PR

• Bug fix
• Addition of a new feature
• Other

Why is this PR needed?
Zero-padding width in filenames when saving to tiffs was wrongly calculated.

What does this PR do?
Fixes the zero-padding width, and tests it's calculated correctly.

How has this PR been tested?

New test added.

Checklist:

• The code has been tested locally
• Tests have been added to cover all new functionality (unit & integration)
• [n/a] The documentation has been updated to reflect any changes
• The code has been formatted with pre-commit

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.73%. Comparing base (3a909b4) to head (7101ed1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #104   +/-   ##
=======================================
  Coverage   92.73%   92.73%           
=======================================
  Files          37       37           
  Lines        1857     1857           
=======================================
  Hits         1722     1722           
  Misses        135      135           

Flag	Coverage Δ
numba	92.67% <100.00%> (ø)

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[IgorTatarnikov]

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