feat(ui): Added themeable stream icons

[renefloor]

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• I have signed the Stream CLA (required).
• The code changes follow best practices
• Code changes are tested (add some information if not applicable)

Description of the pull request

This adds the stream icons as font icons, so we can use the more efficient IconData instead of SVG's.
This also add an option for customers to override (some of) the icons as they are supplied in a theme.

The icons themselves are currently pretty broken, but this should be improved by better svg exports. This PR adds a good structure which we can use going forward. Another PR can fix the actual icons themselves.

Screenshots / Videos

fixed icons:

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✨ Finishing touches

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• Commit unit tests in branch feature/stream-icons

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[codecov]

Codecov Report

❌ Patch coverage is 0.70922% with 140 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main-design-system@1648966). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...flutter/lib/src/theme/primitives/stream_icons.dart	0.71%	139 Missing ⚠️
...flutter/lib/src/theme/stream_theme_extensions.dart	0.00%	1 Missing ⚠️

Additional details and impacted files

@@                  Coverage Diff                  @@
##             main-design-system      #35   +/-   ##
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  Coverage                      ?   45.55%           
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  Files                         ?       74           
  Lines                         ?     1787           
  Branches                      ?        0           
=====================================================
  Hits                          ?      814           
  Misses                        ?      973           
  Partials                      ?        0           

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