[DirectX] Add DXIL_MODULE_FLAG for ShaderFlags. (#83217)

Add DXIL module flag bit offset for SHADER_FEATURE_FLAG.

Added DXIL_MODULE_FLAG for DXIL module flag which does not have feature flag.

Use DXILModuleFlags for ComputedShaderFlags instead of
ShaderFeatureFlags.

ComputedShaderFlags::getFeatureFlags() was added to get FeatureFlags.

Rename DXContainerGlobals::getShaderFlags to DXContainerGlobals::getFeatureFlags.

Fixes #57925