GH-110369
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Validate extension JSON: Error: Field 'classes/AnimationNodeBlendSpace2D/methods/add_blend_point/arguments': size changed value in new API, from 3 to 4.
Validate extension JSON: Error: Field 'classes/AnimationNodeBlendSpace1D/methods/add_blend_point/arguments': size changed value in new API, from 3 to 4.

Added "name" parameter, to functionally replace index reference for points. Compatibility methods registered.
