[Feature]: Allow for python client to work with run groups

Description

In the web client a user is able to add a tag for an existing run group. It would be nice for the python client to be able to query such groups. For example if a group represents a pipeline of runs (load -> process -> train -> evaluate) a user might want to tag such pipeline with experiment tag when the pipeline is finished. And later query all groups (pipelines) with the experiment tag and do some analysis on the pipeline.

Suggested Solution

Implement apis wandb.apis.public.RunGroups and wandb.apis.public.RunGroup so a user can query group of runs and work with them using:

my_group =  api.run_group(path="my_entity/my_project/gropus/my_group")
my_group.tags.append("experiment")
my_group.update()
...
groups = api.run_groups(path="my_entity/my_project", filters={"tag": "experiment})
for group in groups:
    for run in group.runs(filters={"jobType": "train}):
        print(run.summary['accuarcy'])
        

Alternatives

Expose direct GQL queries and mutations so we can do:

import wandb
from wandb.apis.public import gql

api = wandb.Api()

query = gql(
"""
query runGroup {
    id
    name
    notes
    tags {
        name
        colorIndex
    }
  }
"""
)

res = api.client.execute(query)

Or something similar

Additional Context

No response

[MBakirWB]

Hi @SvetoslavKuzmanov ,

Thank you for the follow-up, I will loop in @vanpelt to continue the conversation.

[ramit-wandb]

I see. I agree that that is useful, and I will go ahead and ticket this internally so that this can be implemented in a future update.

Thanks, Ramit