Added SupportsNamespaces interface

[Raalsky]

from neptune.typing import SupportsNamespaces
from neptune import Run


class NeptuneCallback:
    def __init__(self, start_from: SupportsNamespaces):
        self._start_from = start_from

    def log_accuracy(self, accuracy: float) -> None:
        self._start_from["train/acc"] = accuracy


if __name__ == '__main__':
    with Run() as run:
        callback = NeptuneCallback(start_from=run)
        callback.log_accuracy(0.8)

    with Run() as run:
        callback = NeptuneCallback(start_from=run["some/random/path"])
        callback.log_accuracy(0.8)

---

Before submitting checklist

• Did you update the CHANGELOG? (not for test updates, internal changes/refactors or CI/CD setup)
• Did you asked the docs owner to review all the updated user-facing interfaces?

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -71.27 ⚠️

Comparison is base (e0da79e) 71.26% compared to head (5be21c7) 0.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #1280       +/-   ##
==========================================
- Coverage   71.26%   0.00%   -71.27%     
==========================================
  Files         277     279        +2     
  Lines       13586   13610       +24     
==========================================
- Hits         9682       0     -9682     
- Misses       3904   13610     +9706     

Flag	Coverage Δ
e2e	?
unit	?
unit-pull-request	0.00% <0.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/neptune/handler.py	0.00% <0.00%> (-82.45%)	⬇️
src/neptune/metadata_containers/abstract.py	0.00% <0.00%> (ø)
.../neptune/metadata_containers/metadata_container.py	0.00% <0.00%> (-88.48%)	⬇️
src/neptune/typing.py	0.00% <0.00%> (ø)
src/neptune/envs.py	0.00% <0.00%> (-100.00%)	⬇️
src/neptune/__init__.py	0.00% <0.00%> (-100.00%)	⬇️
src/neptune/constants.py	0.00% <0.00%> (-100.00%)	⬇️
src/neptune/common/envs.py	0.00% <0.00%> (-100.00%)	⬇️
src/neptune/legacy/envs.py	0.00% <0.00%> (-100.00%)	⬇️
src/neptune/cli/__init__.py	0.00% <0.00%> (-100.00%)	⬇️
... and 234 more

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[twolodzko]

Could we add get_root_object to the interface? + to Run as something like

def get_root_object(self):
   return self

This is something we use in many integrations and having it as a part of interface would help to avoid unnecessary type checks.

[Raalsky]

As you wish. Done

[twolodzko]

Do we want it to be importable from neptune.integration.utils? Why not just use neptune.metadata_containers.abstract ? Even if we want to keep the neptune.metadata_containers.abstract private, maybe it'd make sense to have it in some kind of "types" or "interfaces" module, it's not something I'll look for in integration.utils.

[Raalsky]

Sure. I've exposed it via neptune.typing. What do you think?

[twolodzko]

I like it, but left few small comments on possible improvements.

[twolodzko]

LGTM