Add Lean mechanism extraction data (typeclasses, attributes, coercions, etc.)

.gitattributes

@@ -62,3 +62,4 @@ edges.csv filter=lfs diff=lfs merge=lfs -text
 mathlib_nodes.csv filter=lfs diff=lfs merge=lfs -text
 mathlib_edges.csv filter=lfs diff=lfs merge=lfs -text
 tactic_usage.ndjson filter=lfs diff=lfs merge=lfs -text
+mechanisms.ndjson filter=lfs diff=lfs merge=lfs -text

mechanisms.ndjson

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:c8d0905876f58af256e2f56bc6ac3c8f90f6a6e5d4c0a4b7f921e3e113e123f9
+size 86007387