Initial rust template generics and template test

[SATVIKsynopsis]

Description

Added the initial Rust generics template implementation and tests.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Documentation update

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[viferga]

It's a good kickstart but we have to think yet how to handle templates over types. Either we can use the clang style, like FunctionTemplate and ClassTemplate types, or create a generic type called Template.. or make Function and Class have template types by default.. I am not sure how to handle it in the best way.

We will need a new interface for instantiate the templates too. So we will need some kind of codegen on the loader side.

[viferga]

why dead code?

[SATVIKsynopsis]

i added it temporarily because generics is only used for the template handling flow right now, will remove it once the template representation is fully integrated.