fix(generators): Changes to exports and access controls for TypeScript compatibility (#7295)

* fix(generators): Add missing declarations for Order enums

* chore(generators): Remove spurious whitespace

* fix(generators): Make provideFunction_ etc. public

  Remove the protected declaration on provideFunction_ and
  FUNCTION_NAME_PLACEHOLDER_ so they can be used from generator
  functions written in TypeScript.

  Not strictly part of #7283, but closely related and required to
  fixing the related issue google/blockly-samples#1785.

* chore(generators): format

(cherry picked from commit d503fbb409)

typings/lua.d.ts

@@ -4,4 +4,19 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+export enum Order {
+  ATOMIC = 0,    // literals
+  // The next level was not explicit in documentation and inferred by Ellen.
+  HIGH = 1,            // Function calls, tables[]
+  EXPONENTIATION = 2,  // ^
+  UNARY = 3,           // not # - ~
+  MULTIPLICATIVE = 4,  // * / %
+  ADDITIVE = 5,        // + -
+  CONCATENATION = 6,   // ..
+  RELATIONAL = 7,      // < > <=  >= ~= ==
+  AND = 8,             // and
+  OR = 9,              // or
+  NONE = 99,
+}
+
 export declare const luaGenerator: any;