Exclude SEL licensed code from AGPL licensed code (closes #783 closes #768)

crates/directory/src/core/principal.rs

@@ -358,11 +358,17 @@ impl PrincipalSet {
     // SPDX-SnippetBegin
     // SPDX-FileCopyrightText: 2020 Stalwart Labs LLC <hello@stalw.art>
     // SPDX-License-Identifier: LicenseRef-SEL
+    #[cfg(feature = "enterprise")]
     pub fn tenant(&self) -> Option<u32> {
         self.get_int(PrincipalField::Tenant).map(|v| v as u32)
     }
     // SPDX-SnippetEnd
 
+    #[cfg(not(feature = "enterprise"))]
+    pub fn tenant(&self) -> Option<u32> {
+        None
+    }
+
     pub fn description(&self) -> Option<&str> {
         self.get_str(PrincipalField::Description)
     }
@@ -1421,10 +1427,16 @@ impl Permission {
         )
     }
 
+    #[cfg(not(feature = "enterprise"))]
+    pub const fn is_tenant_admin_permission(&self) -> bool {
+        false
+    }
+
     // SPDX-SnippetBegin
     // SPDX-FileCopyrightText: 2020 Stalwart Labs LLC <hello@stalw.art>
     // SPDX-License-Identifier: LicenseRef-SEL
 
+    #[cfg(feature = "enterprise")]
     pub const fn is_tenant_admin_permission(&self) -> bool {
         matches!(
             self,