feat(dan): invocation of functions in templates

[mrnaveira]

Description

• New template test that simulates a component with state, a constructor and get/set methods
  • For now we don't perform real calls to handle state and constructor calls as we don't have those implemented yet
• Renamed existing template test to a more proper "hello world" name
• Refactor of all template wasm compilation/execution/test into reusable functions, as much as possible without macros:
  • Template test initialization and invocation
  • Generation of template ABI code
  • Generation of template wasm code, allowing for multiple functions with different signatures

Motivation and Context

One of the next steps in template wasm compilation and execution is the implementation of a more complex example with multiple functions. We also want to refactor as much as possible all common code between examples

How Has This Been Tested?

The new units test for the templates pass

[sdbondi]

Looks good, I think the approach can be refined from here.

[sdbondi]

LGTM 🎉