feat(azure_policy): test runner, compiler fixes, and example program (#700)

Adds the YAML test runner that exercises the companion test data PRs, plus
several compiler fixes surfaced during testing:

- Removed parameter register caching that produced wrong results inside
  short-circuiting allOf/anyOf blocks; added literal-index caching for
  parameter defaults to avoid repeated O(n) literal-table scans
- Simplified cross-resource effect details to only emit roleDefinitionIds
  and type (deployment templates are not evaluated for compliance)
- Replaced guid/uniqueString builtins with clear "unsupported" errors
- Normalized datetime output to ISO 8601 with Z suffix
- Added azure_policy parser MAX_COL constant (8192) for long template
  expressions, keeping the global DEFAULT_MAX_COL at 1024
- Added rvm to azure_policy feature dependencies since the compiler
  targets RVM bytecode

Also restructures the example binary into examples/regorus/ with new
azure-policy-eval and azure-policy-aliases subcommands, adds C# alias
normalization tests, and documents Azure Policy support in the README.

Signed-off-by: Anand Krishnamoorthi <anakrish@microsoft.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

tests/lexer/mod.rs

@@ -339,7 +339,7 @@ fn custom_max_col_allows_wide_line() -> Result<()> {
     use regorus::{Engine, PolicyLengthConfig};
 
     // A line wider than the default 1024 columns.
-    let wide = format!("package test\na := \"{}\"", "x".repeat(2000));
+    let wide = format!("package test\na := \"{}\"", "x".repeat(9000));
 
     let mut engine = Engine::new();
 
@@ -351,7 +351,7 @@ fn custom_max_col_allows_wide_line() -> Result<()> {
 
     // Should succeed with a raised max_col.
     engine.set_policy_length_config(PolicyLengthConfig {
-        max_col: NonZeroU32::new(4096).unwrap(),
+        max_col: NonZeroU32::new(16384).unwrap(),
         ..Default::default()
     });
     engine.add_policy("wide.rego".into(), wide)?;