Replace Requires.jl with Package Extensions

[mofeing]

Using Requires.jl, instrumentation on external libraries is performed on package load time. This reduces the TTFT (Time To First Task or Plot) when loading Extrae.jl.

Unfortunately, it does not allow (a) precompilation of the lazily loaded code nor (b) specify versions of optional libraries.

In order to solve these issues, Julia 1.9 adds Package Extensions and Weak dependencies which are a native implementation of the Requires.jl functionality.