[#686] Save metadata in typed instructions
Description
This MR adds a new Meta
typed meta-instruction for saving arbitrary user metadata. One motivation for this is for Morley debugger, where we need to save Michelson instructions with their index in DFS traversal order, for the purposes of source mapping for LIGO.
Related issue(s)
Resolves #686 (closed)
Part of LIGO-303
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If I fixed a bug, I added a regression test to prevent the bug from silently reappearing again.
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Edited by Heitor Toledo Lassarote de Paula