Did some refactor, add YouTube as search variant

bot/results/common/__init__.py

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+pass

bot/results/common/search.py

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+from aiogram.types import (
+    InlineQueryResultDocument, InlineQueryResultCachedAudio,
+    InlineKeyboardMarkup, InlineKeyboardButton
+)
+
+from bot.modules.database.db import DBDict
+
+from bot.modules.common.song import BaseSongItem
+from typing import TypeVar
+
+
+BaseSongT = TypeVar('BaseSongT', bound=BaseSongItem)
+
+
+async def get_common_search_result(
+        audio: BaseSongT,
+        db_table: DBDict,
+        service_id: str
+) -> InlineQueryResultDocument | InlineQueryResultCachedAudio:
+    return (
+        InlineQueryResultDocument(
+            id=f'{service_id}::' + audio.id,
+            title=audio.name,
+            description=audio.all_artists,
+            thumb_url=audio.thumbnail,
+            document_url=audio.preview_url or audio.thumbnail,
+            mime_type='application/zip',
+            reply_markup=InlineKeyboardMarkup(
+                inline_keyboard=[
+                    [InlineKeyboardButton(text='Downloading...', callback_data='.')]
+                ]
+            ),
+            caption=audio.full_name,
+        ) if audio.id not in list(db_table.keys()) else
+        InlineQueryResultCachedAudio(
+            id=f'{service_id}c::' + audio.id,
+            audio_file_id=db_table[audio.id],
+        )
+    )