RUST-2137 Support $lookup in CSFLE and QE (#51)

Author: isabelatkinson

mongocrypt/src/ctx.rs

@@ -533,7 +533,7 @@ impl Ctx {
     }
 
     /// Create a scope guard that provides handles to pending KMS requests.
-    pub fn kms_scope(&mut self) -> KmsScope {
+    pub fn kms_scope(&mut self) -> KmsScope<'_> {
         KmsScope { ctx: self }
     }
 
@@ -651,7 +651,7 @@ impl<'ctx> KmsScope<'ctx> {
     ///
     /// If KMS handles are being handled synchronously, the driver can reuse the same
     /// TLS socket to send HTTP requests and receive responses.
-    pub fn next_kms_ctx(&self) -> Option<KmsCtx> {
+    pub fn next_kms_ctx(&self) -> Option<KmsCtx<'_>> {
         let inner = unsafe { sys::mongocrypt_ctx_next_kms_ctx(*self.ctx.inner.borrow()) };
         if inner.is_null() {
             return None;

mongocrypt/src/lib.rs

@@ -236,6 +236,15 @@ impl CryptBuilder {
         self
     }
 
+    /// Enable support for multiple collection schemas. Required to support $lookup.
+    pub fn enable_multiple_collinfo(self) -> Result<Self> {
+        let ok = unsafe { sys::mongocrypt_setopt_enable_multiple_collinfo(*self.inner.borrow()) };
+        if !ok {
+            return Err(self.status().as_error());
+        }
+        Ok(self)
+    }
+
     /// Opt-into skipping query analysis.
     ///
     /// If opted in: