BUILD_SHARED_LIBS project option impacts all depenndencies

[blozano-tt]

We use the CMake customary cache variable "BUILD_SHARED_LIBS" to determine if we should build our libraries as static or shared.

tt-metal/cmake/project_options.cmake

Line 10 in ab3dc0c

option(BUILD_SHARED_LIBS "Create shared libraries" ON)

This variable globally impacts all of the dependencies we bring in through CPM, including those brought in by UMD's CPM. So if it is set, then nng ends up being a shared library.

We don't really want BUILD_SHARED_LIBS to globally impact our dependencies.

Maybe we should have something like METALIUM_BUILD_SHARED_LIBS as a project option, and then set BUILD_SHARED_LIBS

cc: @afuller-TT @broskoTT

Originally posted by @blozano-tt in #15527