feature: add support for Vnish T21 and update docs

docs/miners/antminer/X21.md

@@ -79,6 +79,19 @@
         show_root_heading: false
         heading_level: 0
 
+## T21 (VNish)
+
+- [x] Shutdowns
+- [ ] Power Modes
+- [x] Setpoints
+- [ ] Presets
+
+::: pyasic.miners.antminer.vnish.X21.T21.VNishT21
+    handler: python
+    options:
+        show_root_heading: false
+        heading_level: 0
+
 ## S21 (ePIC)
 
 - [x] Shutdowns

docs/miners/supported_types.md

@@ -704,6 +704,7 @@ details {
             <summary>X21 Series:</summary>
                 <ul>
                     <li><a href="../antminer/X21#s21-vnish">S21 (VNish)</a></li>
+                    <li><a href="../antminer/X21#t21-vnish">T21 (VNish)</a></li>
                 </ul>
         </details>
     </ul>

pyasic/miners/antminer/vnish/X21/T21.py

@@ -0,0 +1,22 @@
+# ------------------------------------------------------------------------------
+#  Copyright 2022 Upstream Data Inc                                            -
+#                                                                              -
+#  Licensed under the Apache License, Version 2.0 (the "License");             -
+#  you may not use this file except in compliance with the License.            -
+#  You may obtain a copy of the License at                                     -
+#                                                                              -
+#      http://www.apache.org/licenses/LICENSE-2.0                              -
+#                                                                              -
+#  Unless required by applicable law or agreed to in writing, software         -
+#  distributed under the License is distributed on an "AS IS" BASIS,           -
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.    -
+#  See the License for the specific language governing permissions and         -
+#  limitations under the License.                                              -
+# ------------------------------------------------------------------------------
+
+from pyasic.miners.backends import VNish
+from pyasic.miners.device.models import T21
+
+
+class VNishT21(VNish, T21):
+    pass

pyasic/miners/antminer/vnish/X21/__init__.py

@@ -15,3 +15,4 @@
 # ------------------------------------------------------------------------------
 
 from .S21 import VNishS21
+from .T21 import VNishT21

pyasic/miners/factory.py

@@ -563,6 +563,7 @@ MINER_CLASSES = {
         "ANTMINER S19 PRO HYD.": VNishS19ProHydro,
         "ANTMINER S19K PRO": VNishS19kPro,
         "ANTMINER T19": VNishT19,
+        "ANTMINER T21": VNishT21,
         "ANTMINER S21": VNishS21,
     },
     MinerTypes.EPIC: {