Deprecate operator & for getting addresses

[aidanfnv]

The prefix & operator for taking addresses has unclear semantics on GPU targets and is not intended to be part of the Slang language going forward.

This change adds an unconditional error (30086: "the '&' operator for taking addresses is no longer supported in Slang") when the resolved function has KnownBuiltinDeclName::OperatorAddressOf, emitted from CheckInvokeExprWithCheckedOperands. The operator& declaration itself is unchanged. Internal code uses __getAddress instead.

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[dubiousconst282]

For clarification, is this deprecating overloading support for this particular operator, or just addressing of arbitrary L-values? Full removal would be a bit unfortunate since it's not that uncommon that I write code like int* a = &ptr[offset] or &pStruct->array[0] around pointers.