SCIL-22: Implenting basic statements and syntax into the emitter (#271)

* Creating tests to arrive at  paths

* Adding source loader

* Preparing for multi file loading

* Fixing failure on empty function block

* Fixing issue with ByteStr

* Minor update

* Updating test cases with more paths of unimplemented emitters

* Enabling outcommented test

* Preparing refactor

* Preparing for template types

* Formatting

* WiP

* WiP

* Removing accidental commit

* Making the playground build again

* Disabling test that are WiP

products/bluebell/core/src/evm_bytecode_generator.rs

@@ -479,6 +479,7 @@ impl<'ctx> EvmBytecodeGenerator<'ctx> {
                                     ref name,
                                     owner: _,
                                     ref arguments,
+                                    template_type_arguments: _
                                 } => {
                                     if arguments.len() > 0 {
                                         // TODO: Pack data

products/bluebell/core/src/intermediate_representation/ast_queue.rs

@@ -0,0 +1,12 @@
+use scilla_parser::ast::nodes::NodeProgram;
+
+/// Trait for a queue that lists the next Ast to be compiled.
+pub trait AstQueue {
+    /// Add a library to the queue.
+    fn enqueue(&mut self, library_name: &str) -> Result<(), String>;
+
+    /// Add a library to the queue.
+    fn enqueue_with_alias(&mut self, library_name: &str, alias_name: &str) -> Result<(), String>;
+    /// Get the next Ast to be converted to the IR.
+    fn pop_front(&mut self) -> Option<NodeProgram>;
+}