Support for comments

[Jannis]

It would be great if cost models written in Agora supported comments, allowing indexers to take note of why certain queries are priced in a certain way, why matching rules are placed in a certain order, or simply to structure cost models in neat way.

[That3Percent]

It's worth noting that Agora already has support for comments, but unfortunately these are in limited position (preceding a statement) https://github.com/graphprotocol/mission-control-indexer/blob/master/guides/agora/language/reference/statements.md#comments We can expand support to include more positions though.

[1ybe]