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Preserve source error extensions when merging schemas

Currently, when merging multiple schemas together, custom error
`extensions` (like custom errors `code`'s, custom error
properties, etc.) are dropped when errors are returned from
child resolvers. This is caused by the current schema stitching
error handling code creating copies of errors before reporting
them, but not including all properties of the original error
in the copy.

This commit adjusts the schema stitching error handling code
to preserve the `originalError` details when creating error
copies. This helps `mergeSchemas` (and other parts of
`graphql-tools`) include all source error `extensions`, when
reporting errors through the merged schema.

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