docs: update release link to v0.3.0 and add missing vault functions

[aguilar1x]

• Updates release badge to point to vc-vault-v0.3.0
• Adds authorized_issuer_count and denied_issuer_count to the Vault functions row (were missing from the summary table)

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

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Run ID: ccfbf8b1-04da-4626-9e62-940a14784a2b

📥 Commits

Reviewing files that changed from the base of the PR and between ae347aa and 61ebbab.

📒 Files selected for processing (1)

• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/release-vc-vault-v0.3.0

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