feat: add binary_trees benchmark suite and fix string escape for tab character

Add Lua, Python, Ruby, and Wren implementations of the binary_trees benchmark from the Computer Language Benchmarks Game. Update the benchmark runner to support multiple benchmarks with output validation, and fix the Wren compiler to handle the '\t' escape sequence in string literals.

src/wren_compiler.c

@@ -401,12 +401,13 @@ static void readString(Parser* parser)
         case '"':  addStringChar(parser, '"'); break;
         case '\\': addStringChar(parser, '\\'); break;
         case 'n':  addStringChar(parser, '\n'); break;
+        case 't':  addStringChar(parser, '\t'); break;
         default:
           // TODO(bob): Emit error token.
           break;
       }
 
-      // TODO(bob): Other escapes (/t, /r, etc.), Unicode escape sequences.
+      // TODO(bob): Other escapes (\r, etc.), Unicode escape sequences.
     }
     else
     {