[r] add print method for dim reductions

[immanuelazn]

User description

Check out reference pages for IterativeLSI() and LSI() to have a better clue of what these look like.

I took a generally simple approach for a print method, and am only providing cell embedding sizes, feature names, and param names in fitted_params. Styling is relatively similar to what was provided with IterableMatrix and IterableFragment objects. I tried to do some wrapping so each line only outputs 5 objects at a time. I might replace this with the tibble::str_wrap() method since it seems to be a little bit more elegant.

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PR Type

Enhancement, Documentation

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Description

• Added a print method for DimReduction objects.

• Enhanced examples in LSI and IterativeLSI documentation.

• Updated namespace to include print.DimReduction S3 method.

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Changes walkthrough 📝

	Relevant files
Configuration changes	NAMESPACE Register `print.DimReduction` in namespace.                            r/NAMESPACE Added print.DimReduction as an S3 method. +1/-0
Enhancement	singlecell_utils.R Add `print.DimReduction` method for formatted output.        r/R/singlecell_utils.R Implemented print.DimReduction method for better object display. Added formatted output for embeddings, features, and parameters. +28/-1
Documentation	IterativeLSI.Rd Update `IterativeLSI` documentation with examples.              r/man/IterativeLSI.Rd Enhanced examples with dim_reduction output display. Improved documentation formatting. +2/-1      LSI.Rd Update `LSI` documentation with examples.                                r/man/LSI.Rd Enhanced examples with lsi_result output display. Improved documentation formatting. +1/-0

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