[0.3.0-draft] Include the full wasi:random/imports

This switches `wasi:http/proxy` from just using `wasi:random/random` to
also including `wasi:random/insecure` and `wasi:random/insecure-seed`.

These "insecure" interfaces allow applications which need random numbers
for purposes other than cryptography or UUIDs to request them, which can
give hosts more flexibility when running in environments with scarce
entropy, such as early boot environments.

These interfaces should be easy to support in any host that already
supports `wasi:random/random`. They permit alternate implementation
strategies, but don't require them.

Author: sunfishcode

wit-0.3.0-draft/worlds.wit

@@ -6,7 +6,7 @@ package wasi:http@0.3.0-rc-2025-09-16;
 world service {
   /// HTTP services have access to time and randomness.
   include wasi:clocks/imports@0.3.0-rc-2025-09-16;
-  import wasi:random/random@0.3.0-rc-2025-09-16;
+  include wasi:random/imports@0.3.0-rc-2025-09-16;
 
   /// Services have standard output and error streams which are expected to
   /// terminate in a developer-facing console provided by the host.