Examples do not support new ListSource APIs

[rmartin16]

Describe the bug

Several of the example apps are not updated to support the changes to ListSource APIs and crash at startup or while interacting with them.

beeliza/beeliza/app.py:        self.chat.data.append(
detailedlist/detailedlist/app.py:            self.dl.data.insert(index, **item)
detailedlist/app.py:            self.dl.data.append(**item)
table/app.py:        self.table1.data.insert(0, *choice(bee_movies))
tree/tree/app.py:        self.tree.data.append(root, **item)
tree/tree/app.py:        self.decade_1940s = self.tree.data.append(
tree/tree/app.py:        self.decade_1950s = self.tree.data.append(
tree/tree/app.py:        self.decade_1960s = self.tree.data.append(
tree/tree/app.py:        self.decade_1970s = self.tree.data.append(
tree/tree/app.py:        self.decade_1980s = self.tree.data.append(
tree/tree/app.py:        self.decade_1990s = self.tree.data.append(
tree/tree/app.py:        self.decade_2000s = self.tree.data.append(

Steps to reproduce

Run an affected example app.

Expected behavior

The example apps should run properly.

Screenshots

No response

Environment

• Operating System: pop os 22.04
• Python version: 3.10.12
• Software versions:
  • Briefcase: 0.3.16.dev94+gcd4044e2
  • Toga: 0.3.2.dev745+g9a482d3a9

Logs

No response

Additional context

No response

[freakboy3742]

This should be resolved by #2011, #2017 and #2025.