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>

Author: anakrish

Cargo.toml

@@ -25,6 +25,7 @@ default = ["full-opa", "arc", "rvm"]
 arc = ["scientific/arc"]
 ast = []
 azure_policy = ["dep:jsonschema", "arc", "dashmap"]
+azure-rbac = []
 base64 = ["dep:data-encoding"]
 base64url = ["dep:data-encoding"]
 coverage = []