3.29.2 - Fix overhaul breakage, part 2

What's Changed

Fix overhaul breakage, part 2 by @gwynne in #176

This solves the source code breakage issue first reported in #175 - shout out and thanks to @NeedleInAJayStack for reporting the problem!

Several preexisting APIs had incorrectly changed from accepting any Encodable to accepting some Encodable, which is source-breaking under some conditions. This restores the original use of any (though it keeps the added Sendable requirement).

Also restores 100% test coverage after the previous fixes.

[!NOTE]
Many APIs which had previously accepted a generic parameter (i.e. <E: Encodable>), most notably in SQLPredicateBuilder, also switched to using some Encodable, but this was not source-breaking; the problem applied only to APIs which originally accepted any Encodable.

Although the changes in this PR are technically themselves source-breaking, since they revert a previous such breakage to its previous state, only a semver-patch bump is necessary.

This patch was released by @gwynne

Full Changelog: 3.29.1...3.29.2