Tree Widget: Add support for react 18

[saskliutas]

Tree widget does not work with react 18 in StrictMode due to double rendering.

[muthubentley]

@saskliutas All the below packages doesnt have react 18 as their peer dependency.

1. @itwin/breakdown-trees-react
2. @itwin/measure-tools-react
3. @itwin/property-grid-react
4. @itwin/tree-widget-react

All of them belongs to this repo. Will you be able to fix all of them with this issue or do you need a separate issue for fixing each package?

[grigasp]

@saskliutas All the below packages doesnt have react 18 as their peer dependency.

1. @itwin/breakdown-trees-react
2. @itwin/measure-tools-react
3. @itwin/property-grid-react
4. @itwin/tree-widget-react

All of them belongs to this repo. Will you be able to fix all of them with this issue or do you need a separate issue for fixing each package?

@muthubentley I believe it's best if we have an issue per package. I filed one for the property grid.

Note: We don't own all the mentioned packages, so we're only going to look into tree-widget-react and property-grid-react. Other teams will need to look into others (adding @aruniverse).

[muthubentley]

Thanks @grigasp
Created new issues for @itwin/breakdown-trees-react and @itwin/measure-tools-react
#677
#678