convert avatar to a slash command and make it show a list of members

app/cogs/user_functions.py

@@ -1,3 +1,4 @@
+from discord import option
 from discord.ext import commands
 import core_utils
 import discord
@@ -8,9 +9,10 @@ class Users(commands.Cog):
     def __init__(self, bot):
         self.bot: commands.Bot = bot
 
-    @commands.command(name="avatar")
+    @commands.slash_command(guild_ids=None, name="avatar")
+    @option("User", description="Choose a member", input_type="user")
     async def avatar(self, ctx: commands.Context, user: discord.Member):
-        await ctx.reply(
+        await ctx.respond(
             embed=core_utils.generate_embed(
                 embed_title="{}#{}".format(user.name, user.discriminator),
                 embed_url=user.avatar,