Expand builder (#20)

* Add bool method

* Add proptest

* Add some more consts and stuff

* Refactor Lambda stuff out

* REfactor

* Convert bytestring test to prop test

* Add string constant

* Add char stuff, despite it not being ready

* Add unit

* Add var

* Add delay

* Add apply

* Add force

* Add error

* Add builtin

* Add example, remove feature

* Rename some stuff

Co-authored-by: Turner <mitch@tpfs.io>

crates/uplc/examples/identity_builder_ext.rs

@@ -0,0 +1,15 @@
+use uplc::program_builder::{Builder, WithLambda, WithTerm, WithVar};
+
+trait WithIdentity: WithTerm + WithLambda + WithVar {
+    fn with_identity(self, name_str: &str) -> Self::Next {
+        self.with_lambda(name_str).with_var(name_str)
+    }
+}
+
+impl<T: WithTerm> WithIdentity for T {}
+
+fn main() {
+    let my_var = "some_var";
+    let program = Builder::start(1, 2, 3).with_identity(my_var).build_named();
+    println!("{:#?}", program);
+}