Add support for customization with MUI theme to inputs

[Madeorsk]

Problem

Some inputs are not customizable by themes. This adds a way to set custom styles or props on all inputs.

Solution

Use styled components with a defined name in all inputs.

How To Test

make storybook

Then view an input you want to test with and try to change the default theme. For example:

export const defaultLightTheme: ThemeOptions = deepmerge(
    defaultThemeInvariants,
    {
        //...
        components: {
            //...

+           RaTextInput: {
+               styleOverrides: {
+                   root: {
+                       background: 'red',
+                   },
+               },
+           },
        },
    }
);

You can also directly change the "Themed" story of each input.

Additional Checks

• The PR targets master for a bugfix or a documentation fix, or next for a feature
• The PR includes unit tests (if not possible, describe why)
• The PR includes one or several stories (if not possible, describe why)
• The documentation is up to date