TF-3336 Make Echo ping of web socket optional

docs/adr/0056-web-socket-ping-strategy.md

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+# 56. Web Socket Ping Strategy
+
+Date: 2024-12-16
+
+## Status
+
+Accepted
+
+## Context
+
+- Echo ping method takes too much resources from the server
+- Server implemented ping frame
+
+## Decision
+
+- Twake Mail no longer have to implement Echo ping
+- Browser will automatically send pong frame as default implementation
+- Echo ping will still be left as an option in `env.file` through `WS_ECHO_PING`
+  - Set it to `true` if you want to use Echo ping
+  - Set it to `false` or left it as is if you don't want to use Echo ping
+
+## Consequences
+
+- Server resources used will be reduced

docs/configuration/ws_echo_ping_configuration.md

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+## Configuration Web Socket Echo Ping
+
+### Context
+- Echo ping method is optional
+### How to config
+In [env.file]:
+- If you want to use Echo ping:
+```WS_ECHO_PING=true```
+- If you don't want to use Echo ping:
+```WS_ECHO_PING=false```
+    or
+```WS_ECHO_PING=```