Improve DataGrid CSV export (copy & paste)

[timunie]

What does the pull request do?

Fixes some issues with DataGrid-Clipboard implementation like " and \n which were not handled acc. to specs. See: https://csv-spec.org

What is the current behavior?

• Always wrap cell content in "[...]"
• Replace " with "" in order to escape "

What is the updated/expected behavior with this PR?

possible to copy data with " and line breaks

How was the solution implemented (if it's not obvious)?

Checklist

• [ ] Added unit tests (if possible)?
• [ ] Added XML documentation to any related classes?
• [ ] Consider submitting a PR to https://github.com/AvaloniaUI/Documentation with user documentation

Breaking changes

Obsoletions / Deprecations

Fixed issues

[avaloniaui-team]

You can test this PR using the following package version. 0.10.999-cibuild0022440-beta. (feed url: https://nuget.avaloniaui.net/repository/avalonia-all/index.json) [PRBUILDID]

[avaloniaui-team]

You can test this PR using the following package version. 11.0.999-cibuild0031764-beta. (feed url: https://pkgs.dev.azure.com/AvaloniaUI/AvaloniaUI/_packaging/avalonia-all/nuget/v3/index.json) [PRBUILDID]