CRM_Utils_SQL - Add "syncInto()" helper

CRM_Utils_SQL - Add "syncInto()" helper

This is slightly more sugary variant of "INSERT INTO...SELECT...ON DUPLICATE UPDATE..." which requires
less boilerplate/duplication.

Before
------

```php
CRM_Utils_SQL_Select::from('foo_table')
  ->select(['foo_name', 'foo_value1', 'foo_value2'])
  ->insertInto('bar_table', ['bar_name', 'bar_output1', 'bar_output2'])
  ->onDuplicate(['bar_output1 = foo_value1', 'bar_output2 = foo_value2'])
```

After
------

```php
CRM_Utils_SQL_Select::from('foo_table')
  ->syncInto('bar_table', 'bar_name', [
    'bar_name' => 'foo_name',
    'bar_output1' => 'foo_value1',
    'bar_output2' => 'foo_value1',
  ])
```