HTTP Java Conversation API quickstart

[msfussell]

Write the java conversation HTTP quickstart using Tool calling and using the alpha2 apis

[alicejgibbons]

Simple example using Go HTTP Conversation API @salaboy: https://github.com/dapr/quickstarts/pull/1128/files (in PR still, but the HTTP version)

[alicejgibbons]

Moving to 1.16

[alicejgibbons]

@siri-varma can you also take this one since you have completed the SDK one? LMK :)