developer_attribute_initialize: merge float and vector initialize, add variation

One node with a Type menu replaces developer_float_initialize and
developer_vector_initialize, whose internals were identical past the
value-creation wrangle. The Attribute source now works for floats too.
A Variation folder folds in the noise-multiply wrangle that used to sit
after the node in every setup.

Also renames the age1 output to <attr>_age1, matching _age0 and _age2.
The old HDAs are kept for existing hips.

Co-Authored-By: Claude Fable 5.1 <[email protected]>

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