feat(organizations): add optional Telegram notifications for detections

[frgfm]

This PR is greatly inspired from #272 by @blenzi 🙏
It introduces the following modifications:

• add Telegram as a service + test cases (verifying token, channel access, etc.)
• add the possibility for each org to have a dedicated telegram channel ID (created by human admins, where the bot has to be invited)
• when a detection is created, on top of webhooks, we send the detection payload to the channel (unformatted for now)

Here is the updated DB schema: https://dbdiagram.io/d/Pyronear-DB-671e1b9897a66db9a3673d76

cc @MateoLostanlen

[socket-security]

New and removed dependencies detected. Learn more about Socket for GitHub ↗︎

Package	New capabilities	Transitives	Size	Publisher
pypi/httpcore@0.17.3	environment, filesystem, network	0	319 kB	tomchristie
pypi/httpx@0.24.1	environment	0	359 kB	florimondmanca, tomchristie, yeraydiazdiaz

🚮 Removed packages: pypi/httpcore@0.18.0, pypi/httpx@0.25.0

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[codecov]

Codecov Report

Attention: Patch coverage is 71.15385% with 15 lines in your changes missing coverage. Please review.

Project coverage is 85.51%. Comparing base (0248df7) to head (d9b93ab).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/app/services/telegram.py	75.86%	7 Missing ⚠️
src/app/api/api_v1/endpoints/detections.py	50.00%	4 Missing ⚠️
src/app/api/api_v1/endpoints/organizations.py	50.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #381      +/-   ##
==========================================
- Coverage   86.39%   85.51%   -0.89%     
==========================================
  Files          34       35       +1     
  Lines         941      987      +46     
==========================================
+ Hits          813      844      +31     
- Misses        128      143      +15     

Flag	Coverage Δ
backend	85.06% <71.15%> (-0.93%)	⬇️
client	92.06% <ø> (ø)

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