Add info box widgets with CSS stylesheets

[edan-bainglass]

Based on #624

This PR adds info box widgets to provide in-app information to users

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 79.01235% with 17 lines in your changes missing coverage. Please review.

Project coverage is 83.64%. Comparing base (de5f0cc) to head (93d2986).

Files	Patch %	Lines
aiidalab_widgets_base/__init__.py	14.28%	12 Missing :warning:
aiidalab_widgets_base/utils/loaders.py	73.33%	4 Missing :warning:
aiidalab_widgets_base/infobox.py	98.07%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #623 +/- ## ========================================== + Coverage 83.61% 83.64% +0.02% ========================================== Files 16 18 +2 Lines 3522 3595 +73 ========================================== + Hits 2945 3007 +62 - Misses 577 588 +11 ``` | [Flag](https://app.codecov.io/gh/aiidalab/aiidalab-widgets-base/pull/623/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aiidalab) | Coverage Δ | | |---|---|---| | [python-3.11](https://app.codecov.io/gh/aiidalab/aiidalab-widgets-base/pull/623/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aiidalab) | `83.64% <79.01%> (+0.02%)` | :arrow_up: | | [python-3.9](https://app.codecov.io/gh/aiidalab/aiidalab-widgets-base/pull/623/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aiidalab) | `83.68% <79.01%> (+0.02%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=aiidalab#carryforward-flags-in-the-pull-request-comment) to find out more.

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[edan-bainglass]

@superstar54 @unkcpz can you guys have a look at the failed tests? I don't see how my changes could suddenly trigger the following error, which is failing several structure-related tests!

DeprecationWarning: dict interface (SpglibDataset['international']) is deprecated.Use attribute interface ({self.__class__.__name__}.{key}) instead

[superstar54]

Hi @edan-bainglass , spglib released a new version yesterday. Apparently, it drops support for some old API.

[superstar54]

I just created an issue on this: https://github.com/aiidalab/aiidalab-widgets-base/issues/625

[edan-bainglass]

@superstar54 I see. So we need to update on our end? I take it this is unrelated to my PR. I would rebase on top of an update PR once that's in?

Regarding an spglib update PR, do we need it? Can we instead pin to <2.5.0?

[superstar54]

Regarding an spglib update PR, do we need it? Can we instead pin to <2.5.0?

No idea yet.

[danielhollas]

You can just add the DeprecationWarning to the list of ignored warnings in pyproject.toml

(We have configured pytest so that it turns any warnings into errors, maybe we should change it)