add initial implementation for the @trace decorator

[avaxaleph]

Description

Added support for @trace decorator that can be used with any method inside a Task without the need to pass task_span.

Before Merging

• Review the code changes
  • Unused print / comments / TODOs
  • Missing docstrings for functions that should have them
  • Consistent variable names
  • ...
• Update changelog.md if necessary
• Commit messages should contain a semantic label and the ticket number
  • Consider squashing if this is not the case

[maxhammeralephalpha]

Hi @avaxaleph
can you please add tests and an .ipynb notebook that showcases how you can use the @trace decorator and submit it to Studio?

Another question I have is regarding how the decorator interacts with the tracer that you pass to the run method?