Add ability to seek offsets

[onobc]

[onobc]

Consider support for SeekAware and/or PulsarReader

[cbornet]

NB: Pulsar Reader is available in reactive mode.

[onobc]

Users can manually seek offsets via the seek API on the Consumer or Reader.

For @PulsarListener the consumer can be accessed directly (described here. Once obtained, the seek API can be invoked.

Long term, something like SeekAware (Spring Kafka) is desired. Moving this out of 1.0.0 based on the above.

[ark-tik]

Hey @onobc, can I work on this?

[onobc]

Hi @kartikshrivastava ,

Sure!. I have only looked at this "on the surface" though. I would suggest first coming up w/ a high level design (either discuss here or via a draft PR). It may be helpful to understand how we do this in Spring Kafka. Not that we will do exactly what is done there but it may help w/ ideas.

Thanks