feat: rework how modules are loaded

examples/aiken_std/aiken.toml

@@ -0,0 +1,6 @@
+name = "aiken_std"
+version = "0.1.0"
+licences = ["Apache-2.0"]
+description = "Aiken contracts"
+
+[dependencies]

examples/aiken_std/lib/aiken/context.ak

@@ -0,0 +1,8 @@
+pub type ScriptContext(purpose) {
+    tx_info: TxInfo,
+    script_purpose: purpose,
+}
+
+pub type TxInfo {
+    idk: Int,
+}       

examples/aiken_std/validators/always_true.ak

@@ -0,0 +1,3 @@
+pub fn spend() -> Bool {
+    True
+}