feat: Updates for Policy Framework (#405)

- Documentation
  - Regorus Engine is intended to be used from a single thread
  - Clone the engine after adding policies and data to use from another thread

- Builtin errors strictness:
  - default to less strict for OPA compatibility
  - Provide API to change strictness

- Expose GetAstAsJson to C#,
  This can allow writing policy validations in C#.

- Use spectre mitigated msvc crt libs (binskim compliance)

- Update dependencies

fixes #404

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

src/engine.rs

@@ -832,7 +832,7 @@ impl Engine {
 
     /// Gather output from print statements instead of emiting to stderr.
     ///
-    /// See [`Engine::take_prints`].    
+    /// See [`Engine::take_prints`].
     pub fn set_gather_prints(&mut self, b: bool) {
         self.interpreter.set_gather_prints(b);
     }