FindPkgConfig: Populate _STATIC_LINK_LIBRARIES. Add STATIC_TARGET.

Add LINK_LIBRARIES test to demonstrate static linking of transitive
dependencies.

Add STATIC_TARGET argument to pkg_check_modules() and pkg_search_module().
Influences the properties of target produced by IMPORTED_TARGET.
When enabled: target's properties will be populated from <XXX>_STATIC_*
variables instead of from <XXX>_* variables.

Update existing tests concerning properties of targets produced via
IMPORTED_TARGET, to test STATIC_TARGET variant too.
Update existing tests concerning <XXX>_* variables to test <XXX>_STATIC_*
variables too.

Breaking changes to pkg_check_modules() and pkg_search_module():
- Variables CMAKE_FIND_LIBRARY_PREFIXES and CMAKE_FIND_LIBRARY_SUFFIXES can no
longer be used to influence library lookup (i.e. the internal call to
find_library()), because FindPkgConfig now internally relies on these
variables to differentiate between shared and static library lookup.
Prefer CMAKE_SHARED_LIBRARY_PREFIX + CMAKE_SHARED_LIBRARY_SUFFIX, or
CMAKE_STATIC_LIBRARY_PREFIX + CMAKE_STATIC_LIBRARY_SUFFIX, depending on
whether you wish to impact static or shared lookup.
- <XXX>_LINK_LIBRARIES will now be populated only with libraries
located via CMAKE_SHARED_LIBRARY_PREFIX + CMAKE_SHARED_LIBRARY_SUFFIX match
- <XXX>_STATIC_LIBRARIES now processes -framework options
- <XXX>_STATIC_LDFLAGS_OTHER now processes -framework options
- <XXX>_STATIC_CFLAGS_OTHER now processes -isystem options
- <XXX>_STATIC_INCLUDE_DIRS now processes -isystem options

Fixes: #21714

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