fix: add colspan and rowspan support

[ZehranurC]

Description

Add colspan and rowspan configuration to table columns with proper cell rendering and pagination safety.

Type of Change

• 🆕 New Component
• ✨ Feature / Enhancement
• 🐛 Bug Fix
• 💥 Breaking Change
• 📦 Build / Dependency / Docs Update
• 🧹 Code Refactoring

Screenshots / Preview

Checklist

• Self-reviewed, no leftover logs or debug code
• Uses design tokens — no hardcoded style values
• Accessible (keyboard nav, ARIA, contrast)
• Tests added/updated and passing
• Storybook story added/updated

How to Test

[#EDKUI-1410]

[aktasmehmet]

This is my review v1 :) There are some issues to fix. Then I'll check later.

This PR is so so so important because it directly manipulates the performance related codes of the component. We'll probably need more reviewers here.

[aktasmehmet]

I was going to approve but we've both miss some issues. Please check Chromatic. Here is an example:

[aktasmehmet]

Some resolved but some is still there. It is because of the border-collapse you've put.

PS. For the future, please pay extra attention that the issues are validated before requesting a re-review 🙏

[ZehranurC]

Some resolved but some is still there. It is because of the border-collapse you've put.

PS. For the future, please pay extra attention that the issues are validated before requesting a re-review 🙏

Footer title and value were being displayed in the same cell. Fixed by re-introducing
the footer cell separation logic that was previously removed.

[aktasmehmet]

I've found some issues and stated below

[sonarqubecloud]

Quality Gate passed

Issues
7 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud