IndexedSource and ImageSource bug fixes

[garrettwrong]

Found several small patches going through some documentation/tutorial updates in upstream branches. Cherrypicked into this small pr.

i) rotations dtypes were not enforced and potentially getting mixed
ii) metadata should be copied in case we get a pandas view
iii) filter indices and default identity filter for IndexedSource, same as ArrayImageSource
iv) forgot to call self's generation pipeline in IndexedSource

[codecov]

Codecov Report

Merging #891 (c0ece23) into develop (e9c9586) will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop     #891      +/-   ##
===========================================
+ Coverage    88.58%   88.64%   +0.06%     
===========================================
  Files          117      117              
  Lines         9575     9583       +8     
===========================================
+ Hits          8482     8495      +13     
+ Misses        1093     1088       -5     

Impacted Files	Coverage Δ
src/aspire/source/image.py	91.70% <100.00%> (+0.08%)	⬆️

... and 7 files with indirect coverage changes

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