Allow obtaining a AnonymousViewContext from a ViewContext (#4671)

# Description of Changes

Title.
Is useful to more easily reuse code.
I asked @joshua-spacetime on discord if this would be reasonable and he
said 👍 .
This mirrors the method available on `ReducerContext` for consistency.

# API and ABI breaking changes

None

# Expected complexity level and risk

1 - minimal api surface addition

# Testing

- [x] Tested in my project and works as expected.

---------

Signed-off-by: joshua-spacetime <josh@clockworklabs.io>
Co-authored-by: joshua-spacetime <josh@clockworklabs.io>

Author: kistz

crates/bindings/src/lib.rs

@@ -950,6 +950,11 @@ impl ViewContext {
     pub fn sender(&self) -> Identity {
         self.sender
     }
+
+    /// Obtain an [`AnonymousViewContext`] by dropping `sender`.
+    pub fn as_anonymous(&self) -> AnonymousViewContext {
+        AnonymousViewContext::default()
+    }
 }
 
 /// The context that any reducer is provided with.