Clean up remaining Error associated types that do not use DecodingError

[seanchen1991]

Feature Summary

Most of the TryFrom conversions that convert from raw types in ibc-rs have been converted such that they now return DecodingError. A few hold outs remain that need to be cleaned up, notably the conversions in the ibc-query crate, as well as conversions for the Timestamp type in ibc-primitives. The latter is blocked on #1327 being completed first so that we don't introduce circular dependencies.

Proposal

• Convert the TryFrom impls in the ibc-query crate to use DecodingError
• Convert the TryFrom impls for the Timestamp type in ibc-primitives to use DecodingError once Deprecate the ibc-primitives crate #1327 has been completed