feat: add evals

[omeraplak]

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• The commit message follows our guidelines: https://voltagent.dev/docs/community/contributing/#commit-convention

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• Related issue(s) linked
• Tests for the changes have been added
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What is the current behavior?

What is the new behavior?

fixes (issue)

Notes for reviewers

[changeset-bot]

🦋 Changeset detected

Latest commit: 137cb02

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

This PR includes changesets to release 9 packages

Name	Type
@voltagent/scorers	Major
@voltagent/evals	Major
@voltagent/core	Patch
@voltagent/postgres	Patch
@voltagent/supabase	Patch
@voltagent/libsql	Patch
@voltagent/cli	Patch
@voltagent/sdk	Major
example-with-live-evals	Patch

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