[node] Add tls.getCiphers() and tls.DEFAULT_ECDH_CURVE (#20482)

https://nodejs.org/api/tls.html#tls_tls_getciphers
https://nodejs.org/api/tls.html#tls_tls_default_ecdh_curve

types/node/index.d.ts

@@ -4882,6 +4882,9 @@ declare module "tls" {
     export function connect(port: number, options?: ConnectionOptions, secureConnectListener?: () => void): TLSSocket;
     export function createSecurePair(credentials?: crypto.Credentials, isServer?: boolean, requestCert?: boolean, rejectUnauthorized?: boolean): SecurePair;
     export function createSecureContext(details: SecureContextOptions): SecureContext;
+    export function getCiphers(): string[];
+
+    export var DEFAULT_ECDH_CURVE: string;
 }
 
 declare module "crypto" {

types/node/node-tests.ts

@@ -979,6 +979,9 @@ namespace tls_tests {
             port: 55
         };
         var tlsSocket = tls.connect(connOpts);
+
+        const ciphers: string[] = tls.getCiphers();
+        const curve: string = tls.DEFAULT_ECDH_CURVE;
     }
 
     {