Enable sanitizers globally

[PolarGoose]

My project adds 3rd party dependencies via FetchContent_Declare:

FetchContent_Declare(
  mbedtls
  GIT_REPOSITORY https://github.com/Mbed-TLS/mbedtls
  GIT_TAG v3.6.5)
FetchContent_MakeAvailable(mbedtls)

add_library(exampleProj main.cpp)
target_link_libraries(exampleProj PUBLIC mbedtls)

add_library(exampleProj_sanitizers INTERFACE)
myproject_enable_sanitizers(exampleProj_sanitizers ON ON ON OFF OFF)
target_link_libraries(exampleProj PUBLIC exampleProj_sanitizers)

As you can see, myproject_enable_sanitizers only allows me to enable sanitizers for my own code, not for 3rd-party dependencies.
I don't think this is entirely correct. Sanitizers should be used for all code.