feat: Add Azure RBAC condition parser (#496)

* feat: Add Azure RBAC condition parser

- declare an `azure-rbac` feature and expose the Azure RBAC module with parser, AST, and YAML-driven tests
- extend the shared lexer with RBAC-specific tokens, single-quoted strings, and corrected raw-string spans
- verify the parser via comprehensive test cases covering every operator and complex chaining

Signed-off-by: Anand Krishnamoorthi <anakrish@microsoft.com>



---------

Signed-off-by: Anand Krishnamoorthi <anakrish@microsoft.com>

src/parser.rs

@@ -82,10 +82,8 @@ impl<'source> Parser<'source> {
 
     pub fn token_text(&self) -> &str {
         match self.tok.0 {
-            TokenKind::Symbol | TokenKind::Number | TokenKind::Ident | TokenKind::Eof => {
-                self.tok.1.text()
-            }
             TokenKind::String | TokenKind::RawString => "",
+            _ => self.tok.1.text(),
         }
     }