Components: support step="any" in NumberControl and RangeControl

[ciampo]

What

Accept any as a valid value for the step prop of the NumberControl and RangeControl components

Why

The input[type=number] and input[type=range] HTML elements support any as a value for the step attribute (#, #).

NumberControl and RangeControl aim at being a superset of these components, and should therefore support the step="any" case. Currently, this is not supported and causes the value of the inputs to become NaN

Also, partially related: #33156

A/C

• Introduce support for step="any" to NumberControl and RangeControl, following the expected behaviour from the HTML spec
• Add Storybook examples for both components
• Update the step prop docs in both components README:
  • The property can now be of type number | "any"
  • Add a paragraph explaining the how the component should behave when passing "any"
• Add a CHANGELOG entry in the @wordpress/components package