refactor: refactor x/token,collection query errors #980
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Description
This patch would refactor the query APIs on x/token and x/collection.
The following items are the ground rules over the query APIs.
Motivation and context
The client requested consistent error policy over the query APIs. Also no more backward compatibility is required by the client. So we refactor those APIs before the launch.
Checklist:
CHANGELOG.md
client/docs/swagger-ui/swagger.yaml