Update COMPAT.md, add fk related opcodes

parser/src/ast.rs

@@ -1416,6 +1416,8 @@ pub enum PragmaName {
     Encoding,
     /// Current free page count.
     FreelistCount,
+    /// Enable or disable foreign key constraint enforcement
+    ForeignKeys,
     /// Run integrity check on the database file
     IntegrityCheck,
     /// `journal_mode` pragma