Add extra field to store plugin display name

[goanpeca]

References and relevant issues

• Part of https://github.com/napari/napari-plugin-manager/issues/14
• Needed for PR at plugin manager repo https://github.com/napari/napari-plugin-manager/pull/32

Description

To be able to display the display name field of plugins (when provided) an extra field needs to be sent as part of the iter plugins function.

This PR adds the fielf so it can be used by the plugin manager plugin

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 92.38%. Comparing base (5f4c898) to head (65a5b91).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #6841 +/- ## ========================================== - Coverage 92.44% 92.38% -0.06% ========================================== Files 614 614 Lines 54843 54843 ========================================== - Hits 50700 50668 -32 - Misses 4143 4175 +32 ```

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