Inline the (Yul)Statement parser in v0/v1 (#658)

Part of #652

Seems convenient for the AST/CST (to not need to unwrap another layer)
but we lose the ability to test it as a named parser and the generated
parser code gets a bit bloated, since we now inline the choice.

Maybe it'd be better if we somehow allow to "outline" select enums in
v2, like this one? @OmarTawfik

crates/solidity/inputs/language/definition/04-statements/01-blocks/productions.yml

@@ -20,6 +20,7 @@
 
 - name: "Statement"
   kind: "Parser"
+  inlined: true
   versioned:
     0.4.11:
       choice:

crates/solidity/inputs/language/definition/06-yul/02-yul-statements/productions.yml

@@ -20,6 +20,7 @@
 
 - name: "YulStatement"
   kind: "Parser"
+  inlined: true
   versioned:
     0.4.11:
       choice:

crates/solidity/inputs/language/src/dsl.rs

@@ -493,7 +493,7 @@ slang_grammar! {
 
         parser StateVariableDefinition = ((TypeName (StateVariableAttributesList ?) Identifier ((Equal Expression) ?)) terminated by Semicolon) ;
 
-        parser Statement = (
+        inline parser Statement = (
             SimpleStatement | ControlStatement | AssemblyStatement | Block | { introduced in "0.8.0" UncheckedBlock }
         ) ;
 
@@ -668,7 +668,7 @@ slang_grammar! {
 
         parser YulReturnsDeclaration = (MinusGreaterThan YulIdentifiersList) ;
 
-        parser YulStatement = (
+        inline parser YulStatement = (
             YulBlock | YulFunctionDefinition | YulDeclarationStatement | YulAssignmentStatement | YulIfStatement |
             YulForStatement | YulSwitchStatement | { introduced in "0.6.0" YulLeaveStatement } |
             YulBreakStatement | YulContinueStatement | YulExpression