Move ClientType into Twitch class as an attribute

This allows us to use the base URL as specified in ClientInfo for
requests made to Twitch.

Previously, we'd hardcode "www.twitch.tv" as the base URL to make
channel-related requests, but because we're currently spoofing the
mobile client, that would always cause a HTTP redirect to m.twitch.tv.

This change avoids that HTTP redirect, and potentially saves a whopping
150 ms (or more 😱) when making channel-related requests.

Co-authored-by: DevilXD <4180725+DevilXD@users.noreply.github.com>

constants.py

@@ -112,7 +112,6 @@ MAX_TOPICS = (MAX_WEBSOCKETS * WS_TOPICS_LIMIT) - BASE_TOPICS
 MAX_CHANNELS = MAX_TOPICS // TOPICS_PER_CHANNEL
 # Misc
 DEFAULT_LANG = "English"
-BASE_URL = URL("https://www.twitch.tv")
 # Intervals and Delays
 PING_INTERVAL = timedelta(minutes=3)
 PING_TIMEOUT = timedelta(seconds=10)
@@ -145,7 +144,7 @@ class ClientInfo:
 
 class ClientType:
     WEB = ClientInfo(
-        BASE_URL,
+        URL("https://www.twitch.tv"),
         "kimne78kx3ncx6brgo4mv6wki5h1ko",
         (
             "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 "
@@ -187,7 +186,7 @@ class ClientType:
         ]
     )
     ANDROID_APP = ClientInfo(
-        BASE_URL,
+        URL("https://www.twitch.tv"),
         "kd1unb4b3q4t58fwlpcbzcbnm76a8fp",
         (
             "Dalvik/2.1.0 (Linux; U; Android 7.1.2; SM-G977N Build/LMY48Z) "