LibWeb: Implement generateKey for ECDSA

Author: https://github.com/stelar7
Commit: 41449814db
Pull-request: https://github.com/SerenityOS/serenity/pull/23737
Reviewed-by: https://github.com/ADKaster ✅
Reviewed-by: https://github.com/trflynn89

Userland/Libraries/LibWeb/Crypto/SubtleCrypto.cpp

@@ -575,6 +575,9 @@ SupportedAlgorithmsMap supported_algorithms()
     define_an_algorithm<RSAOAEP, RsaOaepParams>("encrypt"_string, "RSA-OAEP"_string);
     define_an_algorithm<RSAOAEP, RsaOaepParams>("decrypt"_string, "RSA-OAEP"_string);
 
+    // https://w3c.github.io/webcrypto/#ecdsa
+    define_an_algorithm<ECDSA, EcKeyGenParams>("generateKey"_string, "ECDSA"_string);
+
     return internal_object;
 }