compiler, runtime, common, testing: Support Directions on Parameters and Attributed Types

Add support for directions on parameters and attributed types. The
latter is necessary to support the former, but is not limited to
the direction use case. An attributed type is a P4 type with attributes
(like its direction, whether it is read only, etc.) Other attributes
will be added in the future.

Changes necessary to support attributed types include:
1. Global instances tracked during compilation are not attributed
types and not simply types.
2. (future) Type checking will have to make sure that a types
attributes do not affect type compatibility.

Signed-off-by: Will Hawkins <hawkinsw@obs.cr>

Tests/p4rseTests/ControlCompilerTests.swift

@@ -39,8 +39,8 @@ import P4Lang
       }
     };
     """
-  let x = { (tipe: P4Type) -> Bool in
-    switch tipe {
+  let x = { (tipe: P4TypeAttributed) -> Bool in
+    switch tipe.type {
     case let c as Control: c.name == "simple"
     default: false
     }
@@ -73,8 +73,8 @@ import P4Lang
     };
     """
 
-  let filter = { (tipe: P4Type) -> Bool in
-    switch tipe {
+  let filter = { (tipe: P4TypeAttributed) -> Bool in
+    switch tipe.type {
     case let c as Control: c.name == "simple" || c.name == "complex"
     default: false
     }