timer: import submodules only and add tests

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Type of pull request:

• Bug fix
• Feature
• Other

Description:

This PR updates the timer class to make the code more concise and adds tests.

Related Issues:

Addresses #920.

Checklist:

• I have read and followed the contribution guidelines.
• I have added necessary documentation (if applicable).
• The changes pass all existing tests.

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Does somebody know how to add slots to a class so that ruff accepts the code?

I also get TC002 errors in test_bot/test_model.py although I didn't modify the code there.

[MarkZH]

Put the __slots__ declaration below the class's docstring.

Also, when you run ruff on your own machine, make sure you run it using the configuration file: ruff check --config rest_bot/ruff.toml (or with a \ in Windows).

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@MarkZH Thanks for the suggestions, everything looks fine now.

[MarkZH]

For my own curiosity, what was your purpose for adding the __slots__ member to Timer?

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@MarkZH "Slots are more efficient in terms of memory space and speed of access, and a bit safer than the default Python method of data access. " (Python Wiki)