Add edge highlight and extrusion depth to the axis registry (#5108)

axisregistry/Lib/axisregistry/data/edge_highlight.textproto

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+# Edge Highlight, based on https://github.com/justvanrossum/nabla
+tag: "EHLT"
+display_name: "Edge Highlight"
+min_value: 0
+default_value: 12 # Taken from Nabla, but expected to be per-family
+max_value: 1000
+precision: 0
+description:
+  "Controls thickness of edge highlight details."
+fallback {
+  name: "Default"
+  value: 12
+}

axisregistry/Lib/axisregistry/data/extrusion_depth.textproto

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+# Extrusion Depth, based on https://github.com/justvanrossum/nabla
+tag: "EDPT"
+display_name: "Extrusion Depth"
+min_value: 0
+default_value: 100 # Taken from Nabla, but expected to be per-family
+max_value: 1000
+precision: 0
+description:
+  "Controls extrusion depth."
+fallback {
+  name: "Default"
+  value: 100
+}