Added convert_arguments for 1D StatsBase.Histogram to Stairs

[qwjyh]

Description

Fixes # (issue)

Added convert_argument for one dimensional StatsBase.Histogram to Stairs conversion.
For phantom edge and zero-count bin handling, I referenced FHist's implementation.

Type of change

Delete options that do not apply:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• Added an entry in CHANGELOG.md (for new features and breaking changes)
• Added or changed relevant sections in the documentation
• Added unit tests for new algorithms, conversion methods, etc.
• Added reference image tests for new plotting functions, recipes, visual options, etc.