feat: add skeleton shapes and animation speed controls

[jainiksha]

Description

Added enhancements to the Skeleton loading component by introducing customizable shape variants and animation speed controls.

Changes Made

• Added support for text, card, table, and list skeleton shapes.
• Added slow, normal, and fast animation speed options.
• Improved flexibility for creating different loading placeholders.

Closes #1694

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 02265ad6-5be4-45a3-9081-2e785a073882

📥 Commits

Reviewing files that changed from the base of the PR and between 4b874c0 and b6df998.

📒 Files selected for processing (1)

• packages/widgets/src/feedback/Skeleton.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[jainiksha]

@Karanjot786 resolved merge conflict