Settings notify sell in telegram base on sell reason (#5028)

* BREAK: notification sell by sell reason

* Update constants.py

* Update telegram.py

* Update telegram-usage.md

* Update telegram.py

* Update telegram.py

* Fix test fail

* Update config_full.json.example

* Update telegram-usage.md

* Update telegram.py

* Update telegram.py

* Update telegram-usage.md

* validate value of sell object

* Fix linter

* Update constants.py

* Make telegram sample slightly more positive

Co-authored-by: Matthias <xmatthias@outlook.com>

config_full.json.example

@@ -165,7 +165,16 @@
             "startup": "on",
             "buy": "on",
             "buy_fill": "on",
-            "sell": "on",
+            "sell": {
+                "roi": "off",
+                "emergency_sell": "off",
+                "force_sell": "off",
+                "sell_signal": "off",
+                "trailing_stop_loss": "off",
+                "stop_loss": "off",
+                "stoploss_on_exchange": "off",
+                "custom_sell": "off"
+            },
             "sell_fill": "on",
             "buy_cancel": "on",
             "sell_cancel": "on"