[pkg/ottl] Remove ottlarg struct tag

[evan-bradley]

Component(s)

pkg/ottl

Is your feature request related to a problem? Please describe.

The ottlarg struct tag was originally introduced to disambiguate the argument ordering of a field in an OTTL Arguments struct. Now that it's been implemented, it doesn't seem like it is worth the additional complexity of handling it in the OTTL parser. Top-to-bottom is a natural way to read the fields, and all of our tags match the field ordering anyway.

Describe the solution you'd like

Make a breaking change as early as possible and remove ottlarg, instead having functions simply rely on field ordering within the Arguments struct.

Describe alternatives you've considered

No response

Additional context

No response

[rnishtala-sumo]

@evan-bradley I could spend some time on this. It does seem like this will have changes that touch all the Functions/Editors.

[evan-bradley]

Thanks for volunteering. It will touch a lot of code, but should be a straightforward change since we're removing functionality.