feat: generate secret key

Adds generate_secret_key & get_public_key_from_secret_key functions.
Adds generate_secret_key & get_public_key_from_secret_key functions examples to README.md.
Fix list error on Android.
Bump package version to 0.7.0.

example/ios/Podfile.lock

@@ -1237,7 +1237,7 @@ PODS:
     - ReactCommon/turbomodule/bridging
     - ReactCommon/turbomodule/core
     - Yoga
-  - react-native-pubky (0.6.0):
+  - react-native-pubky (0.7.0):
     - DoubleConversion
     - glog
     - hermes-engine
@@ -1757,7 +1757,7 @@ SPEC CHECKSUMS:
   React-logger: 4072f39df335ca443932e0ccece41fbeb5ca8404
   React-Mapbuffer: 714f2fae68edcabfc332b754e9fbaa8cfc68fdd4
   React-microtasksnativemodule: 4943ad8f99be8ccf5a63329fa7d269816609df9e
-  react-native-pubky: 0240de4239550981499983fa50a1aa6fc200823d
+  react-native-pubky: e296eaeb8422b0864f5807592eac144d7d9a6eae
   React-nativeconfig: 4a9543185905fe41014c06776bf126083795aed9
   React-NativeModulesApple: 0506da59fc40d2e1e6e12a233db5e81c46face27
   React-perflogger: 3bbb82f18e9ac29a1a6931568e99d6305ef4403b

example/src/App.tsx

@@ -12,6 +12,8 @@ import {
   resolveHttps,
   publishHttps,
   list,
+  generateSecretKey,
+  getPublicKeyFromSecretKey,
 } from '@synonymdev/react-native-pubky';
 
 export default function App() {
@@ -226,6 +228,39 @@ export default function App() {
           }
         }}
       />
+      <Button
+        title={'generateSecretKey'}
+        onPress={async (): Promise<void> => {
+          try {
+            const res = await generateSecretKey();
+            if (res.isErr()) {
+              console.log(res.error.message);
+              return;
+            }
+            console.log('Generated Secret Key:', res.value);
+          } catch (e) {
+            console.log(e);
+          }
+        }}
+      />
+
+      <Button
+        title={'getPublicKeyFromSecretKey'}
+        onPress={async (): Promise<void> => {
+          try {
+            const res = await getPublicKeyFromSecretKey(
+              'e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855' // Secret Key
+            );
+            if (res.isErr()) {
+              console.log(res.error.message);
+              return;
+            }
+            console.log(res.value);
+          } catch (e) {
+            console.log(e);
+          }
+        }}
+      />
     </View>
   );
 }