[Transforms] Decorator meta data property names, and shape have changed

[mhegazy]

As discussed offline, we should limit the breaking change for this iteration, and include these changes later on.

Expected:

MyClass = __decorate([
    someDecorator, 
    __metadata('design:paramtypes', [db_1.default])
], MyClass);
exports.MyClass = MyClass;

Actual:

MyClass = __decorate([
    someDecorator,
    __metadata("design:typeinfo", {
        paramTypes: function () { return [db_1.default]; }
    })
], MyClass);

Failed tests:

• tests\cases\compiler\decoratorMetadataWithImportDeclarationNameCollision6.ts

[rbuckton]

Fixed in #7919.