Include group information in sampling_info for native sampling

[rthedin]

Summary

Adds additional information for native sampling, written to sampling_info. And switches the file to a yaml format.

Pull request type

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

Checklist

The following is included:

• new unit-test(s)
• new regression test(s)
• documentation for new capability

No unit-test or regression tests performed. I couldn't find any specific manual entry regarding this. Maybe we should create one?

Additional background

Now the sampling_info file will look like this

time 100.3
ngroups 2
group_index 0
  name HighT1_inflow0deg
  sampling_type PlaneSampler
group_index 1
  name HighT2_inflow0deg
  sampling_type PlaneSampler

The reader has been updated accordingly, and outputs the info as follows:

{'time': 100.3,
 'ngroups': 2,
 'HighT1_inflow0deg': {'group_index': '0', 'sampling_type': 'PlaneSampler'},
 'HighT2_inflow0deg': {'group_index': '1', 'sampling_type': 'PlaneSampler'}}

This format works well for me, but happy to hear any comments and feedback regarding the format.

[marchdf]

I made some modifications so the file is now a yaml file. So it will look like this:

time: 0
groups:
 - group_index: 0
   name: line1
   sampling_type: LineSampler

I think this is better future proofing.

[rthedin]

Just to have it documented here, the name of fields have changed since Marc's last comment above. The yaml file looks like this

time: 0
samplers:
 - index: 0
   label: plane1
   type: PlaneSampler
 - index: 1
   label: plane2
   type: PlaneSampler