Change: Make "View Source" a developer tool

[GimleLarpes]

Description

Viewing the raw JSON data for messages is rarely done in normal use by non-developers. Therefore I suggest that enabling this button's visibility is controlled by the "Developer Tools" switch in "Settings">"Developer Tools". This de-clutters the context menu for regular users.

This PR uses the "Developer Tools" switch to control the "View Source" button's visibility in context menus for messages and events.

Fixes #2352

Type of change

• [x] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [o] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [o] This change requires a documentation update

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings

[gmanskibiditoilet]

great feature to be added, since this feature has been existing on element/schildichat for a long time now.

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[GimleLarpes]

Sorry for re-requesting, but the workflow wants another approval