refactor: use trigram search index instead of full text search (#3900)

Co-authored-by: Balu Babu <balub997@gmail.com>

packages/hoppscotch-backend/src/utils.ts

@@ -250,3 +250,40 @@ export function checkEnvironmentAuthProvider(
     }
   }
 }
+
+/**
+ * Adds escape backslashes to the input so that it can be used inside
+ * SQL LIKE/ILIKE queries. Inspired by PHP's `mysql_real_escape_string`
+ * function.
+ *
+ * Eg. "100%" -> "100\\%"
+ *
+ * Source: https://stackoverflow.com/a/32648526
+ */
+export function escapeSqlLikeString(str: string) {
+  if (typeof str != 'string')
+        return str;
+
+    return str.replace(/[\0\x08\x09\x1a\n\r"'\\\%]/g, function (char) {
+        switch (char) {
+            case "\0":
+                return "\\0";
+            case "\x08":
+                return "\\b";
+            case "\x09":
+                return "\\t";
+            case "\x1a":
+                return "\\z";
+            case "\n":
+                return "\\n";
+            case "\r":
+                return "\\r";
+            case "\"":
+            case "'":
+            case "\\":
+            case "%":
+                return "\\"+char; // prepends a backslash to backslash, percent,
+                                  // and double/single quotes
+        }
+    });
+}