feat(solid-form): add withFieldGroup API

[Vijayabaskar56]

🎯 Changes

Add the withFieldGroup API for Form Composition in Solid Form

✅ Checklist

• I have followed the steps in the Contributing guide.
• I have tested this code locally with pnpm test:pr.

🚀 Release Impact

• This change affects published code, and I have generated a changeset.
• This change is docs/CI/dev-only (no release).

[changeset-bot]

🦋 Changeset detected

Latest commit: 71b7a35

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

This PR includes changesets to release 1 package

Name	Type
@tanstack/solid-form	Minor

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View your CI Pipeline Execution ↗ for commit 71b7a35

Command	Status	Duration	Result
nx affected --targets=test:sherif,test:knip,tes...	✅ Succeeded	45s	View ↗
nx run-many --target=build --exclude=examples/**	✅ Succeeded	8s	View ↗

---

☁️ Nx Cloud last updated this comment at 2025-10-02 12:50:20 UTC

[pkg-pr-new]

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commit: 71b7a35

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.23%. Comparing base (6892ed0) to head (71b7a35).
⚠️ Report is 23 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1783      +/-   ##
==========================================
+ Coverage   90.35%   95.23%   +4.88%     
==========================================
  Files          38        4      -34     
  Lines        1752      105    -1647     
  Branches      444        7     -437     
==========================================
- Hits         1583      100    -1483     
+ Misses        149        5     -144     
+ Partials       20        0      -20     

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