Add DSLContext.bulkStore(UpdatableRecord...) and similar methods

[lukaseder]

We already have a means of batching several store operations to the server. This is great as it reduces the latencies of server round trips, and in some JDBC drivers, takes advantage of other server side features (such as implicit FORALL in Oracle, if I'm not mistaken).

Another nice API to add would be equivalent bulkXXX(...) methods, that wouldn't use the JDBC batch API, but create a single bulk statement, e.g.

INSERT INTO t (a, b)
VALUES (1, 2), (3, 4), (5, 6), ...

This can be considerably faster in some databases, too. The API would return a Query, which can then still be batched.

[lukaseder]

The INSERT statement itself already offers such functionality.