stakeholder matrix

copy of https://github.com/equinor/dot-archive/issues/792

Is your feature request related to a problem? Please describe.
Adding a tab with the stakeholders map and their role in the project

```bash
^
High | .
| .
Affected | .
by the | .....................................
decision | .
| .
Low | .
------------------------------------------- >
Low Affecting the decision High
```

No files, tests, or entry points are named. Start by locating the existing tab and project-stakeholder data flow, then review the linked source issue for context. Done means the application has a stakeholder-map tab showing stakeholders by their role and position on the affected-by and decision-influence axes.

Written by the indexing model from the issue text.