For more complex types such as V3D, the python API for TableWorkspace
used to return a incomprehensible string. Now it returns a proper
string type name.

Also some improvements to detector info iterator. Note that I added an
index property. I see this as being particularly useful for users to get
away from the old instrument python API. i.e.

for item : component_info
    if item.index == component_info.source:
        break

They appear to change the API in the javascript layer without fully
reflecting it in the documentation. This even affects the older python
API mantid uses.

Refs #21231

Refs #24000

Refs #24000

Refs #24000