docs: add docs for sleep mode while mining (tari-project#1462)

Description
---
Add findings from testing node's recovery from sleep mode. 

Motivation and Context
---
This area is still not yet well understood and could cause potential
bugs.

docs/sleep_mode/sleep_mode.md

@@ -0,0 +1,48 @@
+# Consequences of Waking Up a Machine Running a Mining Node from Sleep Mode
+
+## While running Tari Universe
+
+### Base Node
+First log after waking up indicates broken communication pipe used by node to connect to other peers.
+
+```
+2025-01-29 14:55:24.170978306 [comms::multiplexing::yamux] [Thread:129377266304576] ERROR 2 Incoming peer substream task received an error because 'i/o error: Broken pipe (os error 32)' // comms/core/src/multiplexing/yamux.rs:300
+```
+
+This is probably caused by other peers that marked this node as offline but node immediately dials back and establish new connections.
+
+```
+2025-01-29 14:55:24.171419010 [comms::dht::connectivity] [Thread:129377253721664] DEBUG Pool peer 73f660ce77716f831a7e72e8b2 disconnected. Redialling... // comms/dht/src/connectivity/mod.rs:682
+
+2025-01-29 14:55:24.171526288 [comms::connection_manager::dialer] [Thread:129377253721664] DEBUG [Attempt 1] Will attempt connection to peer '73f660ce77716f83' in 0 second(s) // /runner/_work/tari/tari/comms/core/src/connection_manager/dialer.rs:507
+
+2025-01-29 14:55:24.172600511 [comms::connection_manager::dialer] [Thread:129377278887488] DEBUG [Attempt 1] Connecting to peer '73f660ce77716f83' // /runner/_work/tari/tari/comms/core/src/connection_manager/dialer.rs:518
+
+2025-01-29 14:55:27.106283709 [comms::connection_manager::dialer] [Thread:129377278887488] DEBUG Dial succeeded for peer '73f660ce77716f83' after 1 attempt(s) // /runner/_work/tari/tari/comms/core/src/connection_manager/dialer.rs:521
+```
+
+### Networking
+Remote nodes mark this node as offline and close the socket, causing message transmission failures.
+
+```
+2025-01-29 15:03:58.437069300 [comms::connection_manager::dialer] [Thread:14060] DEBUG Failed to dial peer '1c8b393640e1cd7d1a86957eb3' because 'IdentityProtocolError(IoError("An existing connection was forcibly closed by the remote host. (os error 10054)"))' // D:\a\tari\tari\comms\core\src\connection_manager\dialer.rs:254
+2025-01-29 15:03:58.437162400 [comms::rpc::client] [Thread:2376] DEBUG Request 1 (method=10) timed out // D:\a\tari\tari\comms\core\src\protocol\rpc\client\mod.rs:755
+2025-01-29 15:03:58.437246200 [comms::dht::network_discovery:onconnect] [Thread:2376] DEBUG Error response from peer 71f3ba3aa7bc62718a955b6d01: Timeout: Response timed out // comms\dht\src\network_discovery\on_connect.rs:164
+```
+
+Most connections to other peers are closed due to TTL timeout, causing the connection to be lost after the first retry.
+
+```
+2025-01-29 15:03:59.188946700 [comms::connection_manager::dialer] [Thread:1572] DEBUG Dial - (Attempt 1) Dial failed on address '/onion3/ohislc44bmyovooseepyksrxgb5unmclnxdxajut7pos4gmhsqd74zad:18141' for peer '4ee514e8472138bf' because 'Transport error for /onion3/ohislc44bmyovooseepyksrxgb5unmclnxdxajut7pos4gmhsqd74zad:18141: TTL expired' // D:\a\tari\tari\comms\core\src\connection_manager\dialer.rs:671
+2025-01-29 15:03:59.189022500 [comms::connection_manager::dialer] [Thread:1572] DEBUG Failed to dial peer 4ee514e8472138bf | Attempt 1 | Error: Failed to connect on all addresses for peer // D:\a\tari\tari\comms\core\src\connection_manager\dialer.rs:531
+2025-01-29 15:03:59.189065200 [comms::connection_manager::dialer] [Thread:1572] DEBUG Failed to dial peer '4ee514e8472138bf8943a34085' because 'ConnectFailedMaximumAttemptsReached' // D:\a\tari\tari\comms\core\src\connection_manager\dialer.rs:254
+```
+
+## Further Investigations
+
+Additional tests should describe the behavior of the node syncing after waking up from sleep mode. Specifically, how nodes recover from lost connections to other peers and possible troubleshooting steps.
+
+
+## Running xmrig miner on laptop on battery power
+
+There seems to be no big differences when mining on laptop that using unplugged to the power (although some laptops have lower efficiency when using battery so hash rate might be lower). There is a [flag](https://xmrig.com/docs/miner/config/misc#pause-on-battery) in xmirg cpu miner that could disable cpu mining altogether while using battery but currently it's not set up.