Canonicalize identifiers in error messages

[mk12]

Zig Version

0.12.0-dev.5+fc6e57568

Steps to Reproduce and Observed Output

$ echo 'const x = @"a\nb";' > test.zig
$ zig build-exe test.zig
test.zig:1:11: error: use of undeclared identifier 'a
                      b'
const x = @"a\nb";
          ^~~~~~~

Expected Output

I'd prefer if the error message represented the identifier the same way it looks in Zig source:

test.zig:1:11: error: use of undeclared identifier @"a\nb"
const x = @"a\nb";
          ^~~~~~~

In other words, print identifiers the same way zig fmt would canonicalize them (#166). And if that requires @"...", then don't bother adding single quotes around it.

[travisstaloch]

Not sure where it would need to be applied, but it seems like changing the error printing code to something like the following would work.

try writer.print("{}", .{std.zig.fmtEscapes(identifier_name)});

[mk12]

Another place this code be done is in the {any} formatting. Maybe I should open another issue for that.