feat(DataGrid): Ability to customize content cell styles using contentStyle

[a11delavar]

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[Copilot]

Pull request overview

This PR introduces the ability to customize content cell styles in DataGrid columns using a new contentStyle property. The feature allows developers to apply conditional styling to cells based on their values and data.

• Adds contentStyle property that accepts string, CSSResult, or function returning either type
• Refactors cell rendering to remove wrapper div and apply styles directly to host element
• Includes comprehensive test coverage for various contentStyle configurations

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
packages/DataGrid/columns/DataGridColumnComponent.ts	Adds contentStyle property and converts methods to properties for binding
packages/DataGrid/DataGridColumn.ts	Defines DataGridColumnContentStyle type and adds contentStyle field
packages/DataGrid/DataGridCell.ts	Implements contentStyle rendering logic and refactors cell layout
packages/DataGrid/DataGrid.ts	Updates type signatures from unknown to any for improved flexibility
packages/DataGrid/DataGrid.test.ts	Adds comprehensive tests for contentStyle functionality
packages/DataGrid/DataGrid.stories.ts	Adds story demonstrating contentStyle usage with balance coloring

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