Material UI v5: rename createMuiTheme to createTheme

Proprietary

Renames the function in its imports and calls. Ported from the MUI codemod v5.0.0/create-theme.

org.openrewrite.react.mui.v5.create-theme
mod run . --recipe=org.openrewrite.react.mui.v5.create-theme

Install it once from Recipe actions, then run it on every repository under the current directory. New to the Moderne CLI? Set it up.