[Pointcloud] New interfaces and automatic asset reloading

[Fireronin]

Resolves #40

Adds AcquirePointcloudFromAsset and UpdatePointCloud
Interfaces to feature processor.

First one creates a ponint cloud based on asset and keeps track of it's changes.
Second one allows for partial updates to pointcloud data

[Fireronin]

I'm unable to fix those formatting issues like I mash reformat and nothing happens, I think my formatting style is correct as I was able to fix other issues using the same formatting

[michalpelka]

Please apply clang-format-15

[michalpelka]

I've fixed code with help of o3de Discord : https://discord.com/channels/805939474655346758/816043601754325023/1271239320698748951
Now hot-realoding works as expected.
Our error was, that we have old and new asset. We should keep reference to AZ::Asset<AZ::Data> and we are responsible to swap this reference. Without that we are stuck with reference to old data. When reference count on old asset goes to zero, it is destroyed. It is smart, but requires understanding.

untitled.webm

With permission from @Fireronin, I've forced pushed code.

[michalpelka]

I've added @norbertprokopiuk @zakmat to review, since they are using this code.

[zakmat]

This is a great improvement. Thanks! I would love to see such handling in other places where we BlockUntilCompleted

There is a small but significant bug in the component's Activate - no check for visibility.
Additionally, the m_numPoints is no longer updated.

[zakmat]

Looks good!