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Feature details

Right now, the Tracker object has no defined __repr__ which makes it hard to interact with and debug,

>>> from pennylane import Tracker
>>> tracker = Tracker()
>>> tracker.update(a=2, b="b2", c=1)
>>> print(tracker)
<pennylane.devices.tracker.Tracker object at 0x1304e3a50>

We would like to add a readable __repr__ to this object that shows all of its relevant internals to the user,

>>> print(tracker)
Tracker(active=..., totals=..., persistent=..., ...)

Implementation

To complete this task, please do the following:

1. Implement a custom __repr__ in the Tracker class.
2. Add appropriate test(s) in tests/devices/test_tracker.py here.

Follow development questions, please ask here or consult our guide.

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