add predicate to obtain symbol ID of a member

Summary: Right now in the swift/scip schema, most predicates require a scip.Symbol (i.e. a symbol ID) to be queried. Symbols IDs for classes can be retrieved with scip.DisplayNameSymbol, but it's much harder for members. In addition, it's hard to connect containers and their members. This diff fixes that.

Reviewed By: phlalx

Differential Revision: D79338724

fbshipit-source-id: 37118a3ae7bef7d658d37a012b0595fc73340fda

Author: Catherine Gasnier

glean/schema/source/swift.angle

@@ -10,4 +10,30 @@ predicate SymbolLanguage:
     symbol: scip.Symbol,
     language: lsif.types.LanguageId
   }
+
+predicate ContainerMember:
+  {
+    container: scip.DisplayName,
+    member: scip.DisplayName,
+    kind: lsif.types.SymbolKind
+  }
+
+predicate MemberContainer:
+  {
+    member: scip.DisplayName,
+    container: scip.DisplayName
+  } stored { M, C } where
+  swift.ContainerMember { C, M, _ }
+
+predicate MemberSymbol:
+  {
+    member: ContainerMember,
+    symbol: scip.Symbol
+  }
+
+predicate SymbolContainer:
+  {
+    symbol: scip.Symbol,
+    container: scip.DisplayName
+  }
 }