Suppress context in ForwardReferenceError and MissingValueError

[m-aciek]

It simplifies the traceback presented to the user, not showing the library internals.

Traceback previously/now for MissingValueError:

Previously:

Traceback (most recent call last):
  File "/Users/maciej.olko/projects/dacite/dacite/core.py", line 72, in from_dict
    value = get_default_value_for_field(field, field_type)
            ~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
  File "/Users/maciej.olko/projects/dacite/dacite/dataclasses.py", line 21, in get_default_value_for_field
    raise DefaultValueNotFoundError()
dacite.dataclasses.DefaultValueNotFoundError

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/maciej.olko/Library/Application Support/JetBrains/PyCharm2024.2/scratches/scratch_167.py", line 11, in <module>
    from_dict(X, {"s": "test"})
    ~~~~~~~~~^^^^^^^^^^^^^^^^^^
  File "/Users/maciej.olko/projects/dacite/dacite/core.py", line 76, in from_dict
    raise MissingValueError(field.name)
dacite.exceptions.MissingValueError: missing value for field "i"

Now:

Traceback (most recent call last):
  File "/Users/maciej.olko/Library/Application Support/JetBrains/PyCharm2024.2/scratches/scratch_167.py", line 11, in <module>
    from_dict(X, {"s": "test"})
    ~~~~~~~~~^^^^^^^^^^^^^^^^^^
  File "/Users/maciej.olko/projects/dacite/dacite/core.py", line 76, in from_dict
    raise MissingValueError(field.name) from None
dacite.exceptions.MissingValueError: missing value for field "i"

Previously/now for ForwardReferenceError:

Previously:

Traceback (most recent call last):
  File "/Users/maciej.olko/projects/dacite/dacite/core.py", line 51, in from_dict
    …  # couldn't really trigger this error
NameError(…)

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/maciej.olko/Library/Application Support/JetBrains/PyCharm2024.2/scratches/scratch_167.py", line 11, in <module>
    from_dict(X, {"s": "test"})
    ~~~~~~~~~^^^^^^^^^^^^^^^^^^
  File "/Users/maciej.olko/projects/dacite/dacite/core.py", line 53, in from_dict
    raise ForwardReferenceError(str(error))
dacite.exceptions.ForwardReferenceError: can not resolve forward reference: 

Now:

Traceback (most recent call last):
  File "/Users/maciej.olko/Library/Application Support/JetBrains/PyCharm2024.2/scratches/scratch_167.py", line 11, in <module>
    from_dict(X, {"s": "test"})
    ~~~~~~~~~^^^^^^^^^^^^^^^^^^
  File "/Users/maciej.olko/projects/dacite/dacite/core.py", line 53, in from_dict
    raise ForwardReferenceError(str(error)) from None
dacite.exceptions.ForwardReferenceError: can not resolve forward reference: 

[m-aciek]

The linting change tested locally with:

% uvx --python 3.9 --exclude-newer=2019-12-17 pylint dacite/core.py
   Built wrapt==1.11.2
   Built lazy-object-proxy==1.4.3
Installed 7 packages in 7ms

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