Error reporting: would be helpful to identify the offending parameter

[JoelPasvolsky]

Description
If you set a dict as the value of an Ising term, ```BinaryQuadraticModel.from_ising()`` correctly errors and reports that the value should not be a dict, but doesn't specify the offending parameter.

Steps To Reproduce

>>> sampleset = DWaveSampler().sample_ising({0: {1, 2}, 1: 0}, {(0, 1): 0}, num_reads=10)
TypeError: must be real number, not set

Here it's clear but if the value was a variable, less so.

Expected Behavior
Be nice to say "TypeError: Ising terms must be real number, not set" or "TypeError: h must be real number, not set"

Environment

• OS: WIN11
• Python version: 3.10

Additional Context
Low priority bug.

[JoelPasvolsky]

Also when setting a number instead of a dict of values, the error message is not intuitive:

>>> sampler = EmbeddingComposite(qpu)
>>> sampleset = sampler.sample_ising({'a': 2}, 0, num_reads=10)
ValueError: diag requires an array of at least two dimensions