This PR introduces the modules `Std.Data.DTreeMap.Raw`,
`Std.Data.TreeMap.Raw` and `Std.Data.TreeSet.Raw` and imports them into
`Std.Data`. All modules related to the raw tree maps are imported into
these new modules so that they are now a transitive dependency of `Std`.
This PR introduces ordered map data structures, namely `DTreeMap`,
`TreeMap`, `TreeSet` and their `.Raw` variants, into the standard
library. There are still some operations missing that the hash map has.
As of now, the operations are unverified, but the corresponding lemmas
will follow in subsequent PRs. While the tree map has already been
optimized, more micro-optimization will follow as soon as the new code
generator is ready.
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Co-authored-by: Paul Reichert <6992158+datokrat@users.noreply.github.com>
