libobs-d3d12: Add D3D12 graphics backend support

[wanhongqing123]

Description

D3D12 is a new api in windows10 and windows11, Direct3D 12 lets apps get closer to hardware than ever before. By being closer to hardware, Direct3D 12 is faster and more efficient.

• Implement all interfaces in graphics.
• If a device support D3D11On12, then use D3D11On12 Device instead.
• Image、duplicator、video、GDI+ source have been tested.

Motivation and Context

As Windows updates and iterates, D3D11 may become obsolete, so D3D12 will be supported here.

How Has This Been Tested?

• Video, Image, Color, Duplicator source is teseted.
• Recording is tested.
• Color Range and Space is tested
• NVIDIA's encoder plugin should be reimplemented using D3D12, but that's not included in this PR for now. I will submit a PR for a D3D12 encoder later.
• The WinRT Capture section reuses the renderer's device code; however, Microsoft's WinRT Capture may not currently support capture strategies for D3D12 devices. I also consulted some resources but couldn't find a WinRT D3D12 capture implementation. Therefore, this is implemented using a shared texture between D3D11 and D3D12.
• Duplicator Capture not supported by D3D12 Device, this is implemented using a shared texture between D3D11 and D3D12.
  you can use D3D12 by:

Types of changes

• New feature (non-breaking change which adds functionality)

Checklist:

• My code has been run through clang-format.
• I have read the contributing document.
• My code is not on the master branch.
• The code has been tested.
• All commit messages are properly formatted and commits squashed where appropriate.
• I have included updates to all appropriate documentation.

[wanhongqing123]

How do I format CMakeLists.txt?

[wanhongqing123]

How do I format CMakeLists.txt? @PatTheMav

[Fenrirthviti]

This, again, appears to have been submitted prematurely. Please do not use the main repo of a project as a staging ground for your work. PRs should be feature complete, compliable, and functional before they are opened.

Additionally, as mentioned in #12817, this fundamental approach has the same issues and the feedback there was not addressed. A d3d12 renderer should be written from scratch and not just be a modification of d3d11. I suggest looking at what was done with the Metal renderer for an idea on how this should be implemented.

Since this is a major addition to the project that you are asking us to accept maintenance for, I would recommend reaching out to have conversations with us first before continuing work.

This PR is not likely to be accepted without a complete change of approach.