compiler,std: implement ZON support

This commit allows using ZON (Zig Object Notation) in a few ways.

* `@import` can be used to load ZON at comptime and convert it to a
  normal Zig value. In this case, `@import` must have a result type.
* `std.zon.parse` can be used to parse ZON at runtime, akin to the
  parsing logic in `std.json`.
* `std.zon.stringify` can be used to convert arbitrary data structures
  to ZON at runtime, again akin to `std.json`.

1 files changed, 1 insertions, 0 deletions

diff --git a/test/behavior/zon/array.zon b/test/behavior/zon/array.zon
new file mode 100644
index 0000000000..8ee5ebe0f5
--- /dev/null
+++ b/test/behavior/zon/array.zon
@@ -0,0 +1 @@
+.{ 'a', 'b', 'c', 'd' }