[erl-lineage] Report edge types call/return
[erl-lineage] Report edge types call/return

Summary:
The internal representation distinguished Call/Return/Direct edges. In
the JSON report, they were all tagged as Copy edges. Now they are
tagged, respectively, as Call/Return/Copy.

Differential Revision:
D37654189

LaMa Project: L1122176

fbshipit-source-id: 5681be1a30e26e95a886e95757e62754f620d2ae

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