[Development] Adding a .gitreview to all repos

[Cristian Le]

I want to gather some feedback about adding a .gitreview file for all repos. The file would look like

```
[gerrit]
host=codereview.qt-project.org
project=qt/qtbase
defaultbranch=dev
```

This would help with out-of-the-box support for some IDEs, e.g. on Jetbrains ones it read this file to determine the default for where to submit the gerrit reviews.

If you have git-review cli you also have more simple interface to submit and fetch changes, e.g.
```
(Cherry-pick gerrit change)
$ git review -x <Change-ID>
(Submit a change)
$ git review -s 6.9
```

For new external contributors this also signals straight away that the projects are managed by gerrit and where to submit the changes.

For more reference about the .gitreview check the upstream documentation [1]. There is also a Jira bug I've opened about adding this file [2].

[1]: https://docs.opendev.org/opendev/git-review/latest/installation.html#gitreview-file-format
[2]: https://bugreports.qt.io/browse/QTBUG-132604
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