Add default.tensor to setup.py

[mudit2812]

As name says.

• default.tensor is the updated name of the tensor network device with the quimb backend. The new change installs it along with lightning.qubit as there are no non-python dependencies to get the device to work.
• Updated the device's name attribute to return default.tensor instead of lightning.tensor.
• Updated the errors raised by the device to use default.tensor instead of LightningTensor or lightning.tensor.

[mlxd]

Thanks Mudit --- can we confirm when building this as a wheel the new folders/files are also included?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.67%. Comparing base (279f7e8) to head (84f7b82).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #719      +/-   ##
==========================================
- Coverage   95.70%   93.67%   -2.03%     
==========================================
  Files          91       16      -75     
  Lines       14054     1835   -12219     
==========================================
- Hits        13450     1719   -11731     
+ Misses        604      116     -488     

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[mudit2812]

[sc-61741]

[PietropaoloFrisoni]

This is obviously a statistical fluctuation. Codecov keeps complaining, but at this point I am not surprised

[vincentmr]

Do we want to replace the following too?

pennylane_lightning/lightning_tensor/backends/quimb/_mps.py:    """A function that determines if an operation is supported by ``lightning.tensor`` for this interface."""
pennylane_lightning/lightning_tensor/backends/quimb/_mps.py:    """A function that determines if an observable is supported by ``lightning.tensor`` for this interface."""
pennylane_lightning/lightning_tensor/lightning_tensor.py:    """A function that determines whether or not a backend is supported by ``lightning.tensor``."""
pennylane_lightning/lightning_tensor/lightning_tensor.py:    """A function that determines whether or not a method is supported by ``lightning.tensor``."""

[mudit2812]

Do we want to replace the following too?

pennylane_lightning/lightning_tensor/backends/quimb/_mps.py:    """A function that determines if an operation is supported by ``lightning.tensor`` for this interface."""
pennylane_lightning/lightning_tensor/backends/quimb/_mps.py:    """A function that determines if an observable is supported by ``lightning.tensor`` for this interface."""
pennylane_lightning/lightning_tensor/lightning_tensor.py:    """A function that determines whether or not a backend is supported by ``lightning.tensor``."""
pennylane_lightning/lightning_tensor/lightning_tensor.py:    """A function that determines whether or not a method is supported by ``lightning.tensor``."""

Where is this from?

[vincentmr]

Where is this from?

I was looking for the lightning.tensor string in files with grep -r "lightning\.tensor" pennylane_lightning/.

[mlxd]

No more concerns from my side. Thanks @mudit2812
Feel free to merge once all CI runs are green.

[vincentmr]

Looks good to me, thanks @mudit2812 .