* test: add unit tests for the subgraph for events transfer, NewTokenName, NewTokenDescription, NewTokenExternalURL, NewTokenENS, NewTokenBuild
* fix: import errors
* fix: remove keyword "indexed" for strings in events.
* fix: update subgraph.yaml, schema.graphql, and all generated files with the test files to match the new interface of the contract events.
* fix: expose a makeEventId function to avoid repeating code for id generation and also change logIndex before handling events. Update tests to match the new changes.
* chore: remove Holder.
* fix: wrong import for newLogoEvent
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