New version of JAXified template synthesis!

This MR is a reimplementation of !11 (closed) , after rebasing the changes.

This version of the JAXified template synthesis is ready to be used and can be merged with the beta release.

A few major updates:

• only JIT compile the heavy functions, which are called outside (there is a wrapper in the class)
• make everything else that do not rely on it being dynamic to be in numpy arrays to make it static
• in particular remove dependency of ModelMeta since its not required to make everything PyTree readable, just important functions
• Include dependency with jax_radio_tools
• implemented filtering & resampling functionality with SlicedShower

TODOs:

• check and make the naming of attributes consistent with the numpy version (#17 (closed) )
• implement the CoREASHDF5 reader into the JAX version
• Implement some way to access slice-specific variables (#3 )
• Make the template saving consistent with numpy version (#17 (closed) )