Add sodium_xxxx_keygen function stubs (#4987)

Author: thePanz

stubs/core.stub

@@ -52,11 +52,76 @@ function sodium_bin2base64(string $string, int $id): string {}
  */
 function sodium_bin2hex(string $string): string {}
 
+/**
+ * @return non-empty-string
+ */
+function sodium_crypto_auth_keygen(): string {}
+
+/**
+ * @return non-empty-string
+ */
+function sodium_crypto_aead_aegis128l_keygen(): string {}
+
+/**
+ * @return non-empty-string
+ */
+function sodium_crypto_aead_aegis256_keygen(): string {}
+
+/**
+ * @return non-empty-string
+ */
+function sodium_crypto_aead_aes256gcm_keygen(): string {}
+
+/**
+ * @return non-empty-string
+ */
+function sodium_crypto_aead_chacha20poly1305_ietf_keygen(): string {}
+
+/**
+ * @return non-empty-string
+ */
+function sodium_crypto_aead_chacha20poly1305_keygen(): string {}
+
+/**
+ * @return non-empty-string
+ */
+function sodium_crypto_aead_xchacha20poly1305_ietf_keygen(): string {}
+
+/**
+ * @return non-empty-string
+ */
+function sodium_crypto_generichash_keygen(): string {}
+
+/**
+ * @return non-empty-string
+ */
+function sodium_crypto_kdf_keygen(): string {}
+
+/**
+ * @return non-empty-string
+ */
+function sodium_crypto_secretstream_xchacha20poly1305_keygen(): string {}
+
 /**
  * @return non-empty-string
  */
 function sodium_crypto_secretbox_keygen(): string {}
 
+/**
+ * @return non-empty-string
+ */
+function sodium_crypto_shorthash_keygen(): string {}
+
+/**
+ * @return non-empty-string
+ */
+function sodium_crypto_stream_keygen(): string {}
+
+/**
+ * @return non-empty-string
+ */
+function sodium_crypto_stream_xchacha20_keygen(): string {}
+
 /**
  * @return ($string is non-empty-string ? non-empty-string : string)
  */