chore: prepare release 0.10.0

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This PR was created automatically. Merging it will create a new release for 0.10.0

Breaking Changes

Consensus diffs

#270 by @lukechampine

This replaces the ForEach update API with slices of "diffs" -- new types wrapping the various element types. This was originally intended as an ergonomics improvement (since it's annoying to e.g. break out of a ForEach callback), but it ended up significantly simplifying most MidState-related code: it consolidated the interrelated maps within MidState, and enabled a much saner rewrite of the update JSON types.

I originally left the ForEach methods in place (with a // Deprecated warning), but later removed them entirely; we're going to update all the callsites in coreutils anyway, so there's little reason to keep them around. (ForEachTreeNode remains, though, since it's used by explored.)

Fixed a panic when unmarshalling unknown spend policy types

An error will now be returned when trying to encode a transaction with an unset SpendPolicy