Configure Connection Strings in ABP

Configure ABP connection strings for modular and multi-tenant apps — the Default connection, per-module databases, grouping modules into one database, and per-tenant database routing. USE FOR: setting the Default connection, giving a module its own database with a named entry, binding a DbContext via [ConnectionStringName], mapping several modules to one DB with AbpDbConnectionOptions.Databases, routing a tenant to its own database, customizing IConnectionStringResolver. DO NOT USE FOR: EF Core DbContext registration/model config (use ef-core-integration), MongoDB client/database setup (use mongodb-integration), creating tenants or the tenant store (use configure-multi-te…