FR: Error struct to wrap Vec<Cause>

[meskill]

Based on the attempt to migrate to the new version of tailcall-valid: tailcallhq/tailcall#3167

In the commit f1ed850 the Error type was removed completely and the Valid type now corresponds to Result<A, Vec<Cause<E, T>> where the Err part is not implementing StdError. This significantly complicates the usage of to_result method and working with errors from Valid.

Provide new wrapper or rollback removal of the Error to simplify the usage of the library.