Validate wires on circuit before executing on new device; add repr to new device

[timmysilv]

Context:
There are some little things that would be nice to have on the new device. Here are 2 of them.

Description of the Change:

• If DQ2 has wires set on it, make sure all circuits running on the device only use those wires
• Added a device repr similar to the old device. The only difference is that if wires or shots are None, I exclude them from the repr. And if they are both None, then I hide the whole parenthesis component of details.

Benefits:

• The new device can't mistakenly run circuits that it shouldn't be able to
• Users see a more meaningful repr when printing a device

[lillian542]

Looks good to me 🎉

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (930c558) 99.65% compared to head (7df0178) 99.65%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4562   +/-   ##
=======================================
  Coverage   99.65%   99.65%           
=======================================
  Files         376      376           
  Lines       33103    33114   +11     
=======================================
+ Hits        32990    33001   +11     
  Misses        113      113           

Files Changed	Coverage Δ
pennylane/devices/experimental/default_qubit_2.py	100.00% <100.00%> (ø)
pennylane/devices/experimental/device_api.py	98.63% <100.00%> (+0.16%)	⬆️

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[albi3ro]

Some minor comments, but nothing blocking 👍