Breaking: sort std/crypto functions into categories

Instead of having all primitives and constructions share the same namespace,
they are now organized by category and function family.

Types within the same category are expected to share the exact same API.

lib/std/cache_hash.zig

@@ -4,7 +4,7 @@
 // The MIT license requires this copyright notice to be included in all copies
 // and substantial portions of the software.
 const std = @import("std.zig");
-const Blake3 = std.crypto.Blake3;
+const Blake3 = std.crypto.hash.Blake3;
 const fs = std.fs;
 const base64 = std.base64;
 const ArrayList = std.ArrayList;