Fix cases for qml.sample(..., counts=True)

[antalszava]

Context:
In a recent PR it was found that the qml.shots(..., counts=True) behaves in unexpected ways in some cases. The original addition was made in this PR.

Description of the Change:

Fixed the use of returning counts when:

• For varying number of wires (other than 3);
• Using the interfaces;
• Counts are returned as part of multiple measurements.

Note that counts now no longer return tensor objects, but rather raw dictionaries or sequences that contain dictionaries.

Benefits:

Returning counts works in more cases as expected.

Possible Drawbacks:
N/A

Related GitHub Issues:
N/A