[Issue 22261] New: import expression does not work in __ctfe context

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22261

          Issue ID: 22261
           Summary: import expression does not work in __ctfe context
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: ttanjo at gmail.com

It would be nice if we can use import expressions in __ctfe context as shown
below.

run.dlang.io: https://t.co/ui274K3Vqa?amp=1

```dlang
import std;

void main()
{
    enum str = load(__FILE__);
}

auto load(string path)
{
    if (__ctfe)
    {
        return import(path);
    }
    else
    {
        return readText(path);
    }
}
```

It fails to compile with the following message:
```console
> rdmd playground.d
onlineapp.d(12): Error: variable `path` cannot be read at compile time
```

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