chore: update release metadata to 2.2.3

[Copilot]

Bumps package version to 2.2.3 and adds corresponding changelog entry referencing the node-bench integration benchmarks project (substrate/bin/node/bench).

Changes

• package.json: version 2.2.2 → 2.2.3
• README.md: adds ### 2.2.3 changelog section

Checklist

• Use the owner account that submitted registrar_reserve to sign the project information, and fill in the signature.
• After each update of the project information, please sign the latest data and submit the signature.
• Add a description for your pr, the description includes the original data.
• Fill up the signature of the original data, signature account to Signature Auto check.

Signature Auto check

Para ID Owner & Signature Account:
<REPLACE THE OWNER>

Data that needs to be signed:
file

Signature Hash: <REPLACE THE SIGNATURE>