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

typings/php.d.ts

@@ -4,4 +4,44 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+export enum Order {
+  ATOMIC = 0,             // 0 "" ...
+  CLONE = 1,              // clone
+  NEW = 1,                // new
+  MEMBER = 2.1,           // []
+  FUNCTION_CALL = 2.2,    // ()
+  POWER = 3,              // **
+  INCREMENT = 4,          // ++
+  DECREMENT = 4,          // --
+  BITWISE_NOT = 4,        // ~
+  CAST = 4,               // (int) (float) (string) (array) ...
+  SUPPRESS_ERROR = 4,     // @
+  INSTANCEOF = 5,         // instanceof
+  LOGICAL_NOT = 6,        // !
+  UNARY_PLUS = 7.1,       // +
+  UNARY_NEGATION = 7.2,   // -
+  MULTIPLICATION = 8.1,   // *
+  DIVISION = 8.2,         // /
+  MODULUS = 8.3,          // %
+  ADDITION = 9.1,         // +
+  SUBTRACTION = 9.2,      // -
+  STRING_CONCAT = 9.3,    // .
+  BITWISE_SHIFT = 10,     // << >>
+  RELATIONAL = 11,        // < <= > >=
+  EQUALITY = 12,          // == != === !== <> <=>
+  REFERENCE = 13,         // &
+  BITWISE_AND = 13,       // &
+  BITWISE_XOR = 14,       // ^
+  BITWISE_OR = 15,        // |
+  LOGICAL_AND = 16,       // &&
+  LOGICAL_OR = 17,        // ||
+  IF_NULL = 18,           // ??
+  CONDITIONAL = 19,       // ?:
+  ASSIGNMENT = 20,        // = += -= *= /= %= <<= >>= ...
+  LOGICAL_AND_WEAK = 21,  // and
+  LOGICAL_XOR = 22,       // xor
+  LOGICAL_OR_WEAK = 23,   // or
+  NONE = 99,              // (...)
+}
+
 export declare const phpGenerator: any;