[theme] HighContrast theme

[silviuaavram]

• I have followed (at least) the PR section of the contributing guide.

Added the changes (excluding the slider borders) to a separate theme object.

To be used like so:

createTheme(..., createHighContrastTheme(), ...)

Fixes #13174

Improves support for Dark High Contrast for our Inputs components. We should continue this effort with:

• Light High Contrast
• Focus / Hover improved support in both Dark and Light High Contrast
• The rest of the components, not just Inputs

For disabled, use GrayText for border, placeholder and text.
For error, use mark for border and text.
For selected, use Highlight for border, HighlightText for text, and none for forcedColorAdjust.
When both error and disabled are true, disabled wins, since there's no point in showing an error control if we can't do anything about it.
Some docs examples needed style changes since they did not support high contrast.

Use Case	Before	After
Disabled Checkbox
Disabled Radio
Input Placeholder
Disabled Inputs
Error Inputs
Autocomplete Disabled Options
Rating Radio Example
Error Radio Example
Disabled Select
Selected Menu Item (works also with Select and Autocomplete)
Disabled Slider
Toggle Button Selected
Toggle Button Selected + Hovered

[code-infra-dashboard]

Bundle size

Bundle	Parsed size	Gzip size
@mui/material	🔺+2.91KB(+0.57%)	🔺+788B(+0.54%)
@mui/lab	0B(0.00%)	0B(0.00%)
@mui/private-theming	0B(0.00%)	0B(0.00%)
@mui/system	0B(0.00%)	0B(0.00%)
@mui/utils	0B(0.00%)	0B(0.00%)

Details of bundle changes

Deploy preview

https://deploy-preview-48319--material-ui.netlify.app/

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