Handle comments in FromBuilder

[stollr]

The following SQL query could be parsed:

SELECT * FROM car /* test comment */ WHERE color = 'black'

but the creator was not able to generate a SQL query from the parsed tree. An UnableToCreateSQLException with the message unknown [expr_type] = comment in "FROM" [0] was thrown in src/PHPSQLParser/builders/FromBuilder.php in line 103.