- add isDark for MediaQuery

[alexandrim0]

Description

Adds parameter for MediaQuery defining dark theme.
Also follows suggestion of linter.

Type of Change

• ✨ New feature or improvement
• 🗑️ Chore

Ready Checklist

• I've read the Contribution Guide.
• In case this PR changes one of the core packages, I've modified the respective CHANGELOG.md file using
  the semantic_changelog format.
• I updated/added relevant documentation (doc comments with ///).
• I added myself to the AUTHORS file (optional, if you want to).

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[github-actions]

Package Version Report

The following packages have been updated:
jaspr : 0.16.4 -> 0.16.5
jaspr_builder : 0.16.4 -> 0.16.5
jaspr_cli : 0.16.4 -> 0.16.5
jaspr_test : 0.16.4 -> 0.16.5

[schultek]

Nice addition, though I would use a ColorScheme enum and keep the prefersColorScheme parameter name. Then its easier to reason about what it does.

Also make sure to add the parameter to the MediaQuery constructors, they are missing there.

And add something to the changelog, e.g.:

## Unreleased patch

- Added `prefersColorScheme` parameter to `MediaQuery`.

[alexandrim0]

Hi!

I`ve changed parameter type and name as suggested.
But I did not add it to change log to prevent conflict.
I hope it wont be a trouble.

Thank you!

[schultek]

LGTM, thanks for the contribution