Add spago files and upgrade code to Purs 15

Author: m-bock

packages.dhall

@@ -0,0 +1,5 @@
+let upstream =
+      https://github.com/purescript/package-sets/releases/download/psc-0.15.4-20220901/packages.dhall
+        sha256:f1531b29c21ac437ffe5666c1b6cc76f0a9c29d3c9d107ff047aa2567744994f
+
+in  upstream

spago.dhall

@@ -0,0 +1,30 @@
+{ name = "option"
+, dependencies =
+  [ "aff"
+  , "argonaut-codecs"
+  , "argonaut-core"
+  , "codec"
+  , "codec-argonaut"
+  , "datetime"
+  , "effect"
+  , "either"
+  , "enums"
+  , "foldable-traversable"
+  , "foreign"
+  , "foreign-object"
+  , "identity"
+  , "lists"
+  , "maybe"
+  , "prelude"
+  , "profunctor"
+  , "record"
+  , "simple-json"
+  , "spec"
+  , "strings"
+  , "transformers"
+  , "tuples"
+  , "unsafe-coerce"
+  ]
+, packages = ./packages.dhall
+, sources = [ "src/**/*.purs", "test/**/*.purs" ]
+}