Deprecate TableGenerator

[morozov]

Q	A
Type	improvement
BC Break	no

I propose to deprecate and later remove the TableGenerator component for the following reasons:

1. It doesn't seem to be used by open-source projects.
2. It's one of the components that use Connection::getParams() which I'd like to get rid of eventually (Connection::getParams() leaks implementation details #3593).
3. This code hasn't received any significant changes since its introduction in 2012 (468af75). This is either because it's perfect or because nobody uses it.

[greg0ire]

Thanks @morozov !