JNI support for ReadOptions::iterate_lower_bound

[moozzyk]

Fixes: #4401

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[seancarroll]

Should we remove There is no lower bound on the iterator from the setIterateUpperBound and iterateUpperBound javadocs?

[moozzyk]

@seancarroll - not sure. The way I read this comment is that "There is no lower bound on the iterator." applies to the forward iterator discussed in the comment. In that sense this information is still correct. On the other hand, because it is a forward iterator, having a lower bound should not matter so maybe this sentence is not needed at all?

[seancarroll]

Ah yes that makes sense.

[sagar0]

Thanks for this contribution!

[sagar0]

Thanks. lgtm!

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