Add one-time use context manager to track impacts without provider patching

[omkar-foss]

Description

Hi! So right now Ecologits.init() patches global provider modules, works great when using Ecologits application-wide, but for one-time use cases, a context manager would be very useful.

Also, it's a problem in shared worker processes (e.g. some data pipelines), where say there are 20 tasks out of which only one needs to be tracked with Ecologits, but the other 19 also end up getting tracked. So here too the context manager would be very helpful to provide tracking specificity.

Could we may be have an additional way like this below?

from ecologits import EcoLogits
from openai import OpenAI

client = OpenAI(api_key="<OPENAI_API_KEY>")

# No patching, Ecologits tracks the request within this context manager and exits cleanly
with Ecologits.track_impacts(client) as ecologits_tracker:
  response = client.chat.completions.create(    
    model="gpt-4o-mini",   
    messages=[{"role": "user", "content": "Tell me a funny joke!"}]
  )

# Get estimated environmental impacts of the inference
print(f"Energy consumption: {ecologits_tracker.impacts.energy.value} kWh")
print(f"GHG emissions: {ecologits_tracker.impacts.gwp.value} kgCO2eq")

Only way right now seems to be to use the Ecologits API directly, but it'd be great to have this feature in here.

Let me know if this makes sense, or if there's some better way to do this, thanks :)