[VARIANT] Create low-level Variant library with json_to_variant implementation

Cargo.toml

@@ -7,6 +7,7 @@ members = [
     "kernel/examples/*",
     "test-utils",
     "feature-tests",
+    "variant",
 ]
 # note that in addition to the members above, the workspace includes examples:
 # - inspect-table

variant/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "variant"
+description = "Low-level library related to the Variant data type."
+edition = "2021"
+
+[dependencies]
+indexmap = "2.9.0"
+rust_decimal = "1.37.2"
+# "arbitrary_precision" allows us to manually parse numbers. "preserve_order" does not automatically
+# sort object keys
+serde_json = { version = "1.0", features = ["arbitrary_precision", "preserve_order"] }
+
+[lib]
+crate-type = ["lib"]