The `bNode.type_legacy` is still used in many places to check if a node is a
specific type. However, going forward it's better to rely more on the idname
than on this legacy integer type. Some more information is available in #132858.
The added utility method can be used like so:
`node->is_type("GeometryNodeMenuSwitch")`. Previously one would have written
`node->type_legacy == GEO_NODE_MENU_SWITCH`. The `is_type` method internally
checks that the passed in string is a valid node identifier to make it more
likely that we catch typos early.
Pull Request: https://projects.blender.org/blender/blender/pulls/132863
259c98fa72