Improve stub for av.option; Improve import style

av/descriptor.pyi

@@ -1,4 +1,4 @@
-from av.option import Option
+from .option import Option
 
 class Descriptor:
     name: str

av/option.pyi

@@ -1,4 +1,4 @@
-from av.enum import EnumFlag, EnumItem
+from .enum import EnumFlag, EnumItem
 
 class OptionType(EnumItem):
     FLAGS: int
@@ -29,3 +29,26 @@ class OptionFlags(EnumFlag):
     EXPORT: int
     READONLY: int
     FILTERING_PARAM: int
+
+class BaseOption:
+    name: str
+    help: str
+    flags: int
+    is_encoding_param: bool
+    is_decoding_param: bool
+    is_audio_param: bool
+    is_video_param: bool
+    is_subtitle_param: bool
+    is_export: bool
+    is_readonly: bool
+    is_filtering_param: bool
+
+class Option(BaseOption):
+    type: OptionType
+    offset: int
+    default: int
+    min: int
+    max: int
+
+class OptionChoice(BaseOption):
+    value: int