Enable turning off marks when step is define in slider components

[nadijagraca]

Description

Alterations of slider and range_slider code.

• Enabling users to turn off marks when step argument is provided.
• Setting marks argument to default to {} instead of None

Users can now set step, but turn off visible marks on their sliders by providing marks=None

Screenshot

Checklist

• I have not referenced individuals, products or companies in any commits, directly or indirectly
• I have not added data or restricted code in any commits, directly or indirectly
• I have updated the docstring of any public function/class/model changed
• I have added the PR number to the change description in the changelog fragment, e.g. Enable feature XXX ([#1](https://github.com/mckinsey/vizro/pull/1)) (if applicable)
• I have added tests to cover my changes (if applicable)

Types of changes

• Docs/refactoring (non-breaking change which improves codebase)
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

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[huong-li-nguyen]

Thanks for fixing the bug! 🚀

[huong-li-nguyen]

Thanks for this!! 🚀

Could you answer one of the users who asked that this is now natively supported after merging? :)

[huong-li-nguyen]

@nadijagraca I just saw that you've changed the default of the step size to 1 - what I meant was to keep the default untouched and just to configure step=1 and marks=None in the app.py if possible?

I don't think we should change the default to 1 - e.g. what happens if min and max are 0 and 1? The defaults should be similar to the underlying component.