Split up db.client.connection.pool.name attribute into its parts

[DanielvNiek]

Area(s)

area:db

What's missing?

The ability to see connection stats per server, per database, and per server-database combo for distributed databases like yugabytedb or cockroachdb.

Describe the solution you'd like

Replace with 4 other attributes also used in sql conventions namely:

1. db.system.name
2. db.namespace
3. server.port
4. server.address

This just breaks up the connection pool name string into its respective parts, allowing for better querying without affecting export performance.

Tip

_{React with 👍 to help prioritize this issue. Please use comments to provide useful context, avoiding +1 or me too, to help us triage it. Learn more here.}