Provide as many Java samples as Go ones

Hi, I understand Golang is the trend and Temporal itself is written in Golang. So it makes sense to make Golang the first citizen for everything.

But the global community use Java much more than Golang. To make this product more popular, and let more people understand how to use it, Java samples are even more important than Golang ones.

Please consider.

Temporal currently has four SDKs:

Go
Java
TypeScript
PHP

We are always looking for community input on ideas for samples (for all SDKs). For Java feel free to open issues here and describe what samples you think are missing and provide ideas of what new samples you would like to see.

You might also find our last Java SDK workshop interesting. Will be doing a second workshop this month and you can sign up for it here. Hope to see you there!