feat: add MongoDB client metadata

[alexbevi]

The PR incorporates MongoDB's wrapping client library specification for the connection handshake to allow library details to be included in the metadata written to mongos or mongod logs.

For example, this change would allow server-side logs such as the following:

{"t":{"$date":"2026-04-20T11:33:05.688+00:00"},"s":"I", "c":"NETWORK", "id":51800, "ctx":"conn70990","msg":"client metadata","attr":{"remote":"192.168.0.1:34567","client":"conn70990","negotiatedCompressors":["zstd"],"doc":{"application":{"name":"my-api-app"},"driver":{"name":"mongo-java-driver|RESTHeart","version":"5.0.0|9.0.0"},"os":{"type":"Linux","name":"Linux","architecture":"amd64","version":"6.1.119-129.201.amzn2023.x86_64"},"platform":"Java/Amazon.com Inc./21.0.8+9-LTS"}}}

For anyone hosting clusters with connections coming from different applications this can help differentiate connections and facilitate log analysis.

This is effectively the same approach taken by Spring Data MongoDB (see SpringDataMongoDB.java, AbstractMongoClientConfiguration.java), and just added to Morphia.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[mkjsix]

This is particularly valuable in multi-application environments where multiple services connect to the same MongoDB cluster:

Microservices architectures — Identify which service made which query
Multi-tenant deployments — Differentiate connections by application
Troubleshooting — Ops teams can quickly identify and isolate RESTHeart-related connection issues
Log analysis — Correlate MongoDB server logs with application logs more easily
Part of a Broader Ecosystem
This approach is now becoming standard across MongoDB drivers and libraries:

✅ Spring Data MongoDB — Already implements this
✅ Morphia — Recently added support
✅ RESTHeart — This PR completes the adoption

Any application using the MongoDB Java driver can implement this pattern, creating a unified view of connections in MongoDB server logs.

[mkjsix]

This is included in release 9.3.0
https://github.com/SoftInstigate/restheart/releases/tag/9.3.0