A Spine example that describes the `set_ik_target` function.

**Describe the example you'd like**
I want to add an example that shows the `set_ik_target` function. To clarify how a developer can manipulate a spine bone using Defold Game Object.

**Additional context (optional)**
I want to use this simple setup for that.

Start by locating existing Spine examples in the Defold examples repository and any references to the `set_ik_target` function. Use the simple setup shown in the issue to demonstrate manipulating a Spine bone through a Defold Game Object, and consider the example complete when it clearly shows how a developer can use that function.

Written by the indexing model from the issue text.