type: Annotate tools and reportlets.utils

[effigies]

This is an initial effort at annotating nireports. This does expose some gaps in the nibabel type stubs that will need to be addressed.

LMK what you think.

[codecov]

Codecov Report

Attention: Patch coverage is 87.83784% with 9 lines in your changes missing coverage. Please review.

Project coverage is 64.29%. Comparing base (f0690a1) to head (8c18471).

Files with missing lines	Patch %	Lines
nireports/reportlets/utils.py	85.71%	3 Missing and 2 partials ⚠️
nireports/tools/ndimage.py	78.94%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #147      +/-   ##
==========================================
- Coverage   65.10%   64.29%   -0.81%     
==========================================
  Files          25       25              
  Lines        2642     2661      +19     
  Branches      415      365      -50     
==========================================
- Hits         1720     1711       -9     
- Misses        811      838      +27     
- Partials      111      112       +1     

Flag	Coverage Δ
unittests	64.93% <87.83%> (?)

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