Improve Workflow API, get rid of the s/Any

The `Workflow` schema for the workflow API contains `:workflow` with `s/Any`. This should likely be improved to match the other APIs so that `:handlers` is at top level for example. Also it should perhaps match the
`:application/workflow`. Perhaps the other APIs have similar needs?

```
(s/defschema Workflow
{:id s/Int
:organization OrganizationOverview
:owneruserid UserId
:modifieruserid UserId
:title s/Str
:workflow s/Any
:licenses [License]
:enabled s/Bool
:archived s/Bool})
```

Locate the Workflow schema shown in the issue and compare it with the other APIs, especially :application/workflow. Determine how :handlers and the remaining workflow fields should be represented at the top level; done means the API schema no longer uses s/Any and is consistent with the corresponding APIs.

Written by the indexing model from the issue text.