Improve pxr CMake Config support by using CMakeFindDependencyMacro CMake module instead of raw find_package

[theblackunknown]

Description of Change(s)

This PR improves the pxr CMake Config supports by using find_dependency from CMakeFindDependencyMacro CMake module instead of raw find_package.

Doing so handling of REQUIRED is not needing anymore as it will be transively forwarded from the find_pckage(pxr ...) calls:

• find_package(pxr REQUIRED ...) results in dependencies being required too
• find_package(pxr ...) results in dependencies being optional too

More information on CMakeFindDependencyMacro CMake module documentation page.

• I have verified that all unit tests pass with the proposed changes
• I have submitted a signed Contributor License Agreement

[jesschimein]

Filed as internal issue #USD-9932

[jesschimein]

/AzurePipelines run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[theblackunknown]

It looks like the Linux build went through but the CI was cancelled, any idea what went wrong ?

[sunyab]

@theblackunknown It looks like the build succeeded but there was some kind of hiccup on the Azure side of things. I requeued the job to double-check.

[theblackunknown]

Hi @sunyab what are my chances to integrate my change for the next release ?

[parkerlreed]

Maybe #3310 can be included in this?

Currently unable to build f3d as it depends on usd which then depends on materialx. Fails at OpenGL since nothing includes it in the cmake.

Manually adding find_package(OpenGL REQUIRED) below the pxr worked to get a build going in the mean time.

[theblackunknown]

Maybe #3310 can be included in this?

Currently unable to build f3d as it depends on usd which then depends on materialx. Fails at OpenGL since nothing includes it in the cmake.

Manually adding find_package(OpenGL REQUIRED) below the pxr worked to get a build going in the mean time.

Looking at your issue @parkerlreed, I think I know what is going on and this requires further improvements which are currently not in this PR.
I would be happy to follow up on those but I would like to get this PR merged first.