Loading data from Big Data Viewer

[IgorTatarnikov]

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Description

What is this PR

• Bug fix
• Addition of a new feature
• Other

Why is this PR needed?
This PR allows loading data from h5 files produced by mesoSPIM.

What does this PR do?
Create a tile class:

• This class holds the resolution pyramid and metadata pertaining to each tile, such as the position within the stitched image.
• The initial position is set based on the stage coordinates provided by the mesoSPIM in the .h5_meta.txt file.

Create an ImageMosaic class:

• This class will hold most of the logic for the package.
• It will hold a list of Tile objects as well as paths to various files/file objects required for downstream operations.

Create a StitchingWidget class that serves as a napari plugin:

• Downsampled data is passed to be displayed in napari.
• The widget keeps a list of tile layers that it's working with to allow updating positions.

How has this PR been tested?

Tests have been written that try to cover most basic cases for the added code. This package will use test data in the form of a downsampled tiled acquisition of one brain. The test data is stored on GIN.

A full size example can be found on ceph at /ceph/neuroinformatics/neuroinformatics/igort/stitching_data/Brain2

Is this a breaking change?

No.

Does this PR require an update to the documentation?

Yes, docs have not been written at this time.

Checklist:

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

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[alessandrofelder]

AFAICT this looks good.
Think all my minor comments are requests to document slightly more explicitly, to help code legibility when it's not as present in our heads :)