[Grid] Add system props

[mnajdova]

BREAKING CHANGE

• [Grid] The props: alignItems, alignContent, justifyContent and their classes and style overrides keys were removed: "align-items-xs-center", "align-items-xs-flex-start", "align-items-xs-flex-end", "align-items-xs-baseline", "align-content-xs-center", "align-content-xs-flex-start", "align-content-xs-flex-end", "align-content-xs-space-between", "align-content-xs-space-around", "justify-content-xs-center", "justify-content-xs-flex-end", "justify-content-xs-space-between", "justify-content-xs-space-around" and "justify-content-xs-space-evenly". These props are now considered part of the system, not on the Grid component itself. If you still wish to add overrides for them, you can use the theme.components.MuiGrid.variants options. For example:

  const theme = createMuiTheme({
    components: {
      MuiGrid: {
  -     styleOverrides: {
  -       "align-items-xs-flex-end": {
  -         marginTop: '20px',
  -       },
  -     },
  +     variants: {
  +       props: { alignItems: "flex-end" },
  +       style: {
  +         marginTop: '20px',
  +       },
  +     }],
      },
    },
  });

---

This PR adds the system props on the Grid component.

Another iteration on #24485

[mnajdova]

These prosp are already part of the system, no need for duplication

[mui-pr-bot]

@material-ui/core: parsed: -0.25% 😍, gzip: -0.19% 😍
@material-ui/lab: parsed: -0.20% 😍, gzip: -0.17% 😍

Details of bundle changes

Generated by 🚫 dangerJS against 886f82c