Add Method to Convert QgsRasterLayer to NumPy Array

[merydian]

Description

This pull request, as part of qgis/QGIS-Enhancement-Proposals#227, introduces a new method to PyQGIS that enables conversion of QgsRasterLayer into a NumPy array. This addition allows users to efficiently handle and analyze raster data using NumPy. This enhancement improves integration with NumPy while keeping it an optional dependency.

[github-actions]

🪟 Windows builds ready!

Windows builds of this PR are available for testing here. Debug symbols for this build are available here.

(Built from commit 67d409e)

[github-actions]

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[nyalldawson]

@merydian can you update this branch based on the raster block work?

[nyalldawson]

@merydian can you rebase against master? There's a merge conflict here now

[nyalldawson]

Perfect, thank you!

[qgis-bot]

@merydian

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