Tissue mask module

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 97.26776% with 5 lines in your changes are missing coverage. Please review.

Project coverage is 97.66%. Comparing base (d4644c5) to head (38eb838). Report is 3 commits behind head on main.

:exclamation: Current head 38eb838 differs from pull request most recent head 9e69ef9

Please upload reports for the commit 9e69ef9 to get more accurate results.

Files	Patch %	Lines
src/patho_pix/utils/custom_tiler.py	97.05%	3 Missing :warning:
src/patho_pix/io.py	77.77%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #14 +/- ## =========================================== - Coverage 100.00% 97.66% -2.34% =========================================== Files 2 7 +5 Lines 44 214 +170 =========================================== + Hits 44 209 +165 - Misses 0 5 +5 ``` | [Flag](https://app.codecov.io/gh/hnu-digihealth/patho-pix/pull/14/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=hnu-digihealth) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/hnu-digihealth/patho-pix/pull/14/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=hnu-digihealth) | `97.66% <97.26%> (-2.34%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=hnu-digihealth#carryforward-flags-in-the-pull-request-comment) to find out more.

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