add ffmpeg mediacodec h264/h265 encode (#8028)

* Check available when app start from kotlin via get codec info
* For latency free, repeat encode 10 frame at most when capture return WouldBlock
* For changing quality, kotlin support but jni doesn't support, rerun video service when quality is manualy
  changed
* 3 or 6 times bitrate for mediacodec because its quality is poor

Signed-off-by: 21pages <pages21@163.com>

libs/scrap/src/common/vpxcodec.rs

@@ -235,6 +235,13 @@ impl EncoderApi for VpxEncoder {
     fn support_abr(&self) -> bool {
         true
     }
+    fn support_changing_quality(&self) -> bool {
+        true
+    }
+
+    fn latency_free(&self) -> bool {
+        true
+    }
 }
 
 impl VpxEncoder {