compression works

Word16 seems to give the best compression ratio. It takes a very long
time to run on >5MB files. Decompression is not implemented yet, but I'm
confident it works.

compress.cabal

@@ -0,0 +1,53 @@
+cabal-version: 3.0
+name:                compress
+version:             0.1.0.0
+category:            Web
+build-type:          Simple
+
+executable compress
+  main-is:
+    Main.hs
+  default-extensions:
+    DataKinds,
+    DeriveAnyClass,
+    DeriveGeneric,
+    DuplicateRecordFields,
+    ExtendedDefaultRules,
+    FlexibleContexts,
+    FlexibleInstances,
+    ImpredicativeTypes,
+    InstanceSigs,
+    MultiParamTypeClasses,
+    NamedFieldPuns,
+    OverloadedLabels,
+    OverloadedLists,
+    OverloadedStrings,
+    PartialTypeSignatures,
+    RankNTypes,
+    RecordWildCards,
+    RecursiveDo,
+    ScopedTypeVariables,
+    StandaloneDeriving,
+    StrictData,
+    TemplateHaskell,
+    TupleSections,
+    TypeApplications,
+    TypeFamilies,
+    TypeOperators,
+    TypeSynonymInstances,
+    UndecidableInstances,
+  hs-source-dirs:
+    src
+  build-depends:
+    base,
+    bitvec,
+    bytestring,
+    cereal,
+    containers,
+    text,
+    uuid,
+    vector
+  default-language:
+    GHC2021
+  other-modules:
+     Data.SortedList