Add quickstart for Conversation AI java sdk

[siri-varma]

Description

Add quickstart for Conversation AI sdk

Issue reference

We strive to have all PRs being opened based on an issue, where the problem or feature have been discussed prior to implementation.

Please reference the issue this PR will close: #1155

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• The quickstart code compiles correctly
• You've tested new builds of the quickstart if you changed quickstart code
• You've updated the quickstart's README if necessary
• If you have changed the steps for a quickstart be sure that you have updated the automated validation accordingly. All of our quickstarts have annotations that allow them to be executed automatically as code. For more information see mechanical-markdown. For user guide with examples see Examples.

[siri-varma]

@salaboy @cicoyle @artur-ciocanu Can you folks take a look at this PR please ?

[cicoyle]

lgtm, thank you!

[siri-varma]

@cicoyle Could you please approve the CI one more time ? I validated it locally. Should succeed now.

[salaboy]

@siri-varma same.. from a pure Java standpoint this PR LGTM, ready to be merged!

[alicejgibbons]

Thanks @siri-varma a couple changes :)

[siri-varma]

Validated locally

[siri-varma]

@alicejgibbons small request, could you please trigger the build for this PR ? Want to make sure it passes so that we will not have any surprises at the end

[cicoyle]

Im honestly fine merging this and then once I cut the official java release we can come back and update the versions everywhere - that way this PR doesnt get blocked

[siri-varma]

@alicejgibbons Do you think we can go ahead and merge this PR now ? I will update the sdks to the latest version once 1.15 is out

[alicejgibbons]

@siri-varma we want to align this PR with the 1.16 conversation changes so will pull those in when we get a 1.16.0 RC 2

[alicejgibbons]

Need to add tool calling to this quickstart for 1.16 as described here: #1213 and retarget 1.16 branch

[alicejgibbons]

Same with this one - if you do the retargeting to 1.16 branch then im happy to add the tool calling bits after your merge!

[siri-varma]

@alicejgibbons Its done

[alicejgibbons]

updating pom dep

[alicejgibbons]

Merging this one since the csharp quickstart is failing due to #1212