[DBX-34] Update API to get current database settings

[dhingrak]

Added: Add more information to the current database settings API response

Fixes: https://linear.app/eventstore/issue/DB-15/new-api-to-get-current-database-settings

The goal of this PR is to provide more information regarding the EventStoreDB database setting so the user who does not have access to the system can see how the database is configured. Attached the current API response and the new API response.

oldAPIresponse.txt
newAPIresponse.txt

[linear]

DB-15 New API to get current database settings

When a user has no access to the box (for example, in ES Cloud), they can't see how the database is configured. For any sort of "control plane" it would be necessary to tell the Ops user what settings the database have. It will also make it easier for Ops people on the customer side to report their configuration to support when they open a ticket.

It's not directly related to the "change settings via API" project, but it seems connected.

Clarify: should the settings be persisted to the config file? Allow both temporary and permanent changes?

[pvanbuijtene]

A few settings are missing and maybe need to decide how we want to expose the settings.

[hayley-jean]

I think we should add units (d) for ScavengeHistoryMaxAge since that's similar to the other time-based units