chore(angular-virtual): proper angular 19

[benjavicente]

🎯 Changes

• Upgrades the adapter to Angular +19. Angular 19 is the latest angular version with LTS.
• Updates the implementation to use computed and linked signals instead of the lazy signal approach. This will make it possible to alias fields of the returned value, like items = this.rowVirtualizer.getVirtualItems.
• Use vite as a bundler for angular since the package does not need any Angular compilation.

About #1096 and #1109, I couldn't replicate the issue with the latest version of virtual. With this upgrade to Angular 19, no effect could trigger directly set a value to a signal.

Pending:

• Confirmation that is ok to state that for Angular the adapter would only target LTS version and up, like query Angular: framework version support policy query#8707
• Aligning some of the following, like TS versions since Angular examples need a newer one.
• I did not manage to add unit tests due to tolling version alignment issues.

✅ Checklist

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

🚀 Release Impact

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

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