Add OpenTelemetry example with Uptrace backend

[vmihailenco]

This PR adds some docs that explain how start monitoring redis-py performance using OpenTelemetry and Uptrace. Here is how the doc page will look like.

I've briefly discussed this on Slack with @chayim and he encouraged me to open a PR to start a discussion. So here I am :)

[codecov-commenter]

Codecov Report

Base: 92.21% // Head: 92.21% // Decreases project coverage by -0.00% ⚠️

Coverage data is based on head (3f11358) compared to base (3a121be).
Patch coverage: 77.14% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2452      +/-   ##
==========================================
- Coverage   92.21%   92.21%   -0.01%     
==========================================
  Files         113      113              
  Lines       29337    29347      +10     
==========================================
+ Hits        27053    27062       +9     
- Misses       2284     2285       +1     

Impacted Files	Coverage Δ
redis/asyncio/client.py	92.51% <ø> (ø)
redis/client.py	89.19% <ø> (ø)
redis/commands/graph/node.py	97.77% <ø> (ø)
redis/commands/search/commands.py	84.61% <0.00%> (ø)
tests/conftest.py	84.94% <ø> (-0.78%)	⬇️
tests/test_asyncio/test_cluster.py	97.48% <0.00%> (-0.13%)	⬇️
tests/test_asyncio/test_commands.py	98.35% <ø> (ø)
tests/test_asyncio/test_connection_pool.py	99.40% <ø> (ø)
tests/test_asyncio/test_pipeline.py	100.00% <ø> (ø)
tests/test_asyncio/test_pubsub.py	99.37% <ø> (-0.16%)	⬇️
... and 15 more

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.

[chayim]

@vmihailenco I think we should probably move these things from the docker folder (to start) into docs/examples. Perhaps even start a subsection on monitoring. WDYT?

[vmihailenco]

I think we should probably move these things from the docker folder (to start) into docs/examples. Perhaps even start a subsection on monitoring. WDYT?

A subsection is probably too much to start with, but I will move everything to docs/examples 👍

[vmihailenco]

Perhaps even start a subsection on monitoring

Sorry, I misread subsection as subfolder. I guess you mean a section in examples.rst? I will play with it.

[vmihailenco]

@chayim PTAL. All should be fixed, but I was not able to update examples.rst in a meaningful manner. Perhaps you could show me an example?

[vmihailenco]

The CI failure seems unrelated...

[vmihailenco]

@chayim I've added the Jupyter notebook we've discussed and updated the title. PTAL

[vmihailenco]

@dvora-h thanks!