[cmake] Rearrange custom cmake package

[hseok-oh]

I think we need new standard to rearrange cmake packages

cc/ @parjong @seanshpark

Concept

External library's source code can be shared by compiler and runtime. But built binary or pre-installed library may not be shared because

• Different target device and OS
• Different build environment (native/cross/gbs) and option (compile & link flag, etc)

Now

• infra/cmake/packages: runtime & compiler common package
  • nnas_find_package wrapper
• `infra/nnfw/cmake/packages: runtime package
  • nnfw_find_package wrapper

TODO

• infra/cmake/packages: package definition for external library code download
  • nnas_find_package wrapper (same)
• infra/nncc/cmake/packages: compiler library package (build result)
  • nncc_find_package wrapper
• infra/nnfw/cmake/packages: runtime library package (build result)
  • nnfw_find_package wrapper: same, but don't download external library code

[seanshpark]

package folder seems to be packages

[glistening]

@hseok-oh

• infra/nncc/cmake/packages: runtime library package (build result)

Maybe infra/nnfw/cmake/package

• nnfw_find_package wrapper: same, but don't download external library code

nnfw_find_package may download external library source (e.g. boost source).

[hseok-oh]

nnfw_find_package may download external library source (e.g. boost source).

Source download package (e.g. boost source) will be moved to infra/cmake/packages

[glistening]

@hseok-oh I meant nnfw_find_package(BOOST) will try to dowonload if BUILD_BOOST is on.