feat: Add command to keyboard

[antonykamp]

Summary

This pull request adds a new feature to improve the user experience in the Telegram bot by making bot commands visible in the Telegram command menu. The main change is the introduction of a post_init function that sets up these commands when the bot starts.

Enhancements to Telegram bot command visibility:

• Added a post_init function that uses BotCommand to define and set bot commands (help, create, attempt, rename, remove) in the Telegram command menu, making them easily discoverable for users.
• Modified the bot initialization to call post_init during application setup by passing it to ApplicationBuilder.post_init, ensuring commands are set when the bot starts.
• Imported BotCommand from the telegram library to support command menu configuration.

Test plan

• Existing tests pass (uv run pytest tests/)

[codecov]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (master@45d15c3). Learn more about missing BASE report.
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
quizbot/bot/bot.py	0.00%	4 Missing ⚠️

Additional details and impacted files

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  Files             ?       10           
  Lines             ?      631           
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  Hits              ?      541           
  Misses            ?       90           
  Partials          ?        0           

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