Add secret fields in plugin configuration

[dominik-zeglen]

I want to merge this change because it adds support for fields like secrets and passwords in plugin configuration.

Screenshots

Pull Request Checklist

1. All visible strings are translated with proper context.
2. All data-formatting is locale-aware (dates, numbers, and so on).
3. Translated strings are extracted to .pot file.
4. Number of API calls is optimized.
5. The changes are tested.
6. Type definitions are up to date.
7. Changes are mentioned in the changelog.

[codecov]

Codecov Report

Merging #246 into master will decrease coverage by 0.38%.
The diff coverage is 55.05%.

@@            Coverage Diff             @@
##           master     #246      +/-   ##
==========================================
- Coverage   74.52%   74.14%   -0.39%     
==========================================
  Files         593      600       +7     
  Lines        6351     6451     +100     
  Branches     1043     1060      +17     
==========================================
+ Hits         4733     4783      +50     
- Misses       1435     1482      +47     
- Partials      183      186       +3

Impacted Files	Coverage Δ
src/plugins/urls.ts	85.71% <ø> (ø)	⬆️
src/intl.ts	100% <ø> (ø)	⬆️
src/plugins/fixtures.ts	100% <ø> (ø)	⬆️
src/components/ActionDialog/ActionDialog.tsx	100% <ø> (ø)	⬆️
src/plugins/utils.ts	100% <100%> (ø)
src/plugins/views/PluginsDetails.tsx	16.27% <19.35%> (ø)
...rc/storybook/stories/plugins/PluginDetailsPage.tsx	60% <33.33%> (-11.43%)	⬇️
...luginSecretFieldDialog/PluginSecretFieldDialog.tsx	45.45% <45.45%> (ø)
...retFieldDialog/PluginSecretFieldDialog.stories.tsx	66.66% <66.66%> (ø)
...onents/PluginAuthorization/PluginAuthorization.tsx	82.35% <82.35%> (ø)
... and 10 more

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