BREAK: rename unevaluated_expression() to unevaluated()

[redeboer]

In @unevaluated_expression, the part _expression is redundant, because the class already derives from sympy.Expr. For instance, the following looks more concise and readable with @unevaluated.

>>> @unevaluated
... class MyExpr(sp.Expr):
...     x: sp.Symbol
...     y: sp.Symbol
...     _latex_repr_ = R"z\left({x}, {y}\right)"
...
...     def evaluate(self) -> sp.Expr:
...         x, y = self.args
...         return x**2 + y**2
...
>>> a, b = sp.symbols("a b")
>>> expr = MyExpr(a, b**2)
>>> sp.latex(expr)
'z\\left(a, b^{2}\\right)'
>>> expr.doit()
a**2 + b**4

We will also see in the next PR, which introduces a argument() field specifier.

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