Store triggers by `DbId` and `TriggerId` instead of name

### Problem

The `ProcessingEngineManagerImpl` stores triggers maps that use `String` names for databases and triggers:

https://github.com/influxdata/influxdb/blob/1f9849be83c4393e113a0846859b544c2452c77e/influxdb3_processing_engine/src/lib.rs#L55-L63

### Proposed solution

* Change to using the `DbId` and `TriggerId` that identify these resources in the catalog.
* Methods that [start](https://github.com/influxdata/influxdb/blob/1f9849be83c4393e113a0846859b544c2452c77e/influxdb3_processing_engine/src/lib.rs#L362)/[stop](https://github.com/influxdata/influxdb/blob/1f9849be83c4393e113a0846859b544c2452c77e/influxdb3_processing_engine/src/lib.rs#L456) triggers should use these IDs as arguments instead of the names.

Start in influxdb3_processing_engine/src/lib.rs at the trigger maps around lines 55-63, then inspect the start and stop methods linked in the issue and their callers. Update the trigger storage and method arguments to use DbId and TriggerId; done means these paths identify resources by catalog IDs rather than names.

Written by the indexing model from the issue text.