Add a version and alias name for Jolt library in CMake

Could a version be added to the `project`? It would be helpful to be able to specify the version of Jolt in `find_package`.



Use case would be something like:



```cmake

find_package(Jolt 5.2.0)

```



Also, could an ALIAS target be added for Jolt? e.g.



```cmake

# ...

add_library(Jolt ${JOLT_PHYSICS_SRC_FILES})

add_library(Jolt::Jolt ALIAS Jolt)

```



I see that Jolt already exports with a namespace as in



```cmake

	export(TARGETS Jolt

		NAMESPACE Jolt::

		FILE JoltConfig.cmake)

```



so it would be helpful to add a namespaced target for linking with Jolt when using `add_subdirectory`.



Use case would be something like:



```cmake

add_subdirectory(vendor/JoltPhysics/Build)

target_link_libraries(my-library PRIVATE Jolt::Jolt)

```



Disclaimer: I am not good at CMake, but I see other projects do this. I can writeup a quick PR if it's relevant!

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