Correct std feature-flagging

If a crate has std set, it should enable std for all dependencies in order to
let them properly select which algorithms to use. Some crates fallback to
slower/worse algorithms on no-std.

Also more aggressively sets default-features = false leading to a *10%*
reduction in the amount of crates coordinator builds.

crypto/dkg/Cargo.toml

@@ -40,16 +40,22 @@ ciphersuite = { path = "../ciphersuite", default-features = false, features = ["
 [features]
 std = [
   "thiserror",
+
   "rand_core/std",
 
   "std-shims/std",
 
-  "ciphersuite/std",
+  "serde/std",
 
-  "multiexp/batch",
+  "transcript/std",
+  "chacha20/std",
+
+  "ciphersuite/std",
   "multiexp/std",
+  "multiexp/batch",
 
   "schnorr/std",
+  "dleq/std",
   "dleq/serialize"
 ]
 serde = ["dep:serde"]