Currently IEx allows configuration of various prompts as strings, I was
curious if we wanted to allow configured nullary functions to return a
string instead. This would allow users to configure their own function to
add things like timestamps to their prompts.
ex:
```elixir
config :iex, default_prompt: fn ->
"#{DateTime.to_string(DateTime.utc_now())} %prefix(%counter)" end
```
I'd also be interested in adding timing data between executions to the
prompt, but that would require a different change.
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