feat: add semantic token support for data-theme attributes

[TimKolberger]

Relates to #5526

📝 Description

This PR allows the semantic tokens to react to data-theme="dark" and data-theme="light" DOM attributes.

• Added [data-theme] to the CSS variables root selector
• Updated _dark and _light pseudo selector

⛳️ Current behavior (updates)

Semantic tokens can only react to "environmental" / global CSS conditions.

🚀 New behavior

To use the LightMode and DarkMode components with those changes, add an additional DOM element with the attribute data-theme="<color-mode>" attached.

<DarkMode>
  <div data-theme="dark">
    <chakra.div color="your-semantic-token">
      This uses always the _dark value of your semantic token
    </chakra.div>
  </div>
</DarkMode>

💣 Is this a breaking change (Yes/No):

No

• add docs PR

[changeset-bot]

🦋 Changeset detected

Latest commit: ab16166

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 7 packages

Name	Type
@chakra-ui/styled-system	Minor
@chakra-ui/system	Minor
@chakra-ui/props-docs	Patch
@chakra-ui/provider	Patch
@chakra-ui/react	Patch
@chakra-ui/skeleton	Patch
@chakra-ui/test-utils	Patch

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📦 A new release has been made for this pull request

To play around with this release, you can install @chakra-ui/react@0.0.0-pr-202215121320 in your project

Latest commit: d2ad43e