Search: add support for Actor Aliases (and perhaps addl. Ext. Id's)

[davidwatkins73]

Description

Use case:

As a data flow owner I wish to store the MIC codes for Market Venues against external actors in Waltz. We cannot use the existing external-id field as it is used to synchronize with internal ref data stores.

Tasks:

• [ ] add alias widget (port to Svelte ?)
• [ ] add to search
• [ ] possibly add support for additional external identifiers (like those available in phys flows)

Resourcing

We would like to collaborate on this feature