Update the DatabaseChunkedReader to take the Connection as input rather than the DataSource

[somandal]

Currently the DatabaseChunkedReader takes a DataSource as input and calls its getConnection() function to obtain a connection to the DB. In the release resources code path, it does not clean up this Connection object, and this is potentially a leak and should be closed. The way we use the DatabaseChunkedReader in Oracle bootstrap is that we reuse the same DataSource for seeding multiple tables. Thus we can potentially expect the Oracle bootstrap task to know when it no longer needs the Connection object and close it. This would require passing the Connection object to the DatabaseChunkedReader instead of the DataSource.

Important: DO NOT REPORT SECURITY ISSUES DIRECTLY ON GITHUB.
For reporting security issues and contributing security fixes,
please, email security@linkedin.com instead, as described in
the contribution guidelines.

Please, take a minute to review the contribution guidelines at:
https://github.com/linkedin/Brooklin/blob/master/CONTRIBUTING.md

[DEEPTHIKORAT]

lgtm

[atoomula]

LGTM