Indexing cross contract calls

Thomas Binétruy-Picrequested to merge
feat/index-cross-contract-calls into master

Until now, cross contract calls were not indexed on Tezos. We attempt to fix this in this MR.

Note that only cross contract calls with depth 1 are supported right now. We'll need recursion to go deeper.

It'd be interesting to handle originated contracts as well to make it easier to retrieve info from indexers.

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