Refactor map and record representation

Replaces the use of `BTreeMap` and `HashMap` for maps and records with
`Vec<(Keyword, Value)>` and `Vec<(Keyword, StaticType)>`. This
simplifies the data structure and allows for ordered iteration, which is
important for serialization and comparison.

Also updates the `unpack` function in `vm.rs` to handle records as well
as lists when destructuring.

examples/data.myc

@@ -1,6 +1,6 @@
 ;; Complex Data Structure Test
 ;; Benchmark: 51.4us
-;; Output: {:input 10, :name "Fibonacci", :output 55}
+;; Output: {:name "Fibonacci", :input 10, :output 55}
 (do
   (def fib (fn [n]
     (if (< n 2)