feat(graphql/v1): accept slugs as query parameters in allCollectives (#2901)
feat(graphql/v1): accept slugs as query parameters in allCollectives (#2901)

* feat(server/graphql/v1/queries): accept arbitrary list of ids | slugs and return collective data

* refactor

OpenCollective/opencollective-api,OpenCollective/opencollective-api,OpenCollective/opencollective-api