Add helper functions to tile image for inference

[timtreis]

import squidpy as sq

sdata = sq.datasets.visium_hne_sdata()
sq.experimental.im.make_tiles(sdata, image_key="hne", preview=True)

import squidpy as sq

sdata = sq.datasets.visium_hne_sdata()
sq.experimental.im.make_tiles_from_spots(
    sdata,
    spots_key="spots",
    image_key="hne",
    tissue_mask_key="hne_tissue",
	preview=True,
)

[codecov]

Codecov Report

❌ Patch coverage is 67.66055% with 141 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.77%. Comparing base (4a40d64) to head (47715be).

Files with missing lines	Patch %	Lines
src/squidpy/experimental/im/_make_tiles.py	68.42%	77 Missing and 49 partials ⚠️
src/squidpy/experimental/im/_utils.py	52.17%	8 Missing and 3 partials ⚠️
src/squidpy/_utils.py	55.55%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1053      +/-   ##
==========================================
+ Coverage   65.52%   65.77%   +0.25%     
==========================================
  Files          43       44       +1     
  Lines        6364     6770     +406     
  Branches     1064     1137      +73     
==========================================
+ Hits         4170     4453     +283     
- Misses       1810     1885      +75     
- Partials      384      432      +48     

Files with missing lines	Coverage Δ
src/squidpy/experimental/im/_detect_tissue.py	51.44% <100.00%> (+0.81%)	⬆️
src/squidpy/_utils.py	56.25% <55.55%> (+0.89%)	⬆️
src/squidpy/experimental/im/_utils.py	39.58% <52.17%> (+4.28%)	⬆️
src/squidpy/experimental/im/_make_tiles.py	68.42% <68.42%> (ø)

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[Zethson]

A few random comments as requested