Allow fallible errors from external implementations of file source #648
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In order to implement the streaming file info poller the trait bounds require the implementer to define an impl of the
MsgDecodetrait which itself requires theTryFromof the source to the destination type but also explicitly defines the TryFrom associated Error type as being file_store::Error. This allows passing errors from external instances of the MsgDecode trait without having to force them into one of the limited pre-defined list of FileStore error variants.