Update ip_points2label

[kostrykin]

Updates of the implementation:

• Add --label_property parameter
• Add --bg_label parameter
• Add --split parameter

Updates of the XML wrapper:

• Add label_property parameter (type text, defaults to name)
• Add bg_label parameter (type integer, defaults to 0)
• Add split parameter (type bool, defaults to False)
• Update required package versions
• Add tests for new parameters
• Automatically choose proper dtype for output images (prefer uint8 over uint16 if possible)

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• I have read the CONTRIBUTING.md document (last updated: 2026/03/06).
• License permits unrestricted use (educational + commercial).
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• This PR adds a new tool or tool collection.
• This PR updates an existing tool or tool collection.
• Tools added/updated by this PR comply with the Guidelines below (or explain why they do not).

Guidelines for the contributor

This section is cited from the Naming and Annotation Conventions for Tools in the Image Community in Galaxy.

Naming

Generally, the name of Galaxy tools in our community should be expressive and concise, while stating the purpose of the tool as precisely as possible. Consistency of the namings of Galaxy tools is important to ensure they can be found easily. To maintain consistency, we consider phrasing names as imperatives a good practice, such as "Analyze particles" or "Perform segmentation using watershed transformation". An acknowledged exception from this rule is the names of tool wrappers of major tool suites, where the name of a tool wrapper should be chosen identically to the module or function of the tool which is wrapped (e.g., "MaskImage" in CellProfiler).

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