chore(docs): add syncing documentation

Author: ziscky

Diff for: docs/learn/advanced/18-syncing.md

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+---
+sidebar_position: 1
+---
+
+# Syncing
+
+Syncing is the process of downloading the blockchain and state from a remote node.
+
+There are two types of syncing:
+
+1. Blockchain syncing.   
+    With block sync a node is downloading all of the data of an application from genesis and verifying it. 
+2. State syncing.   
+    With state sync your node will download data related to the head or near the head of the chain and verify the data. This leads to drastically shorter times for joining a network.
+
+
+## Observing syncing progress
+
+### Block Sync Metrics
+
+- `blocksync_syncing`: Indicates whether a node is currently block syncing.
+- `blocksync_num_txs`: Number of transactions in the latest block.
+- `blocksync_total_txs`: Total number of transactions.
+- `blocksync_block_size_bytes`: Size of the latest block in bytes.
+- `blocksync_latest_block_height`: Height of the latest block.
+
+### Block sync configuration
+
+```toml
+blocksync:
+    version: "v0"
+```
+
+
+### State Sync Metrics
+
+- `statesync_syncing`: Indicates whether a node is currently state syncing.
+
+### State sync configuration
+
+```toml
+statesync:
+    enable: true
+    rpc_servers: ""
+    trust_height: 0
+    trust_hash: ""
+    trust_period: 168h0m0s
+    discovery_time: 15s
+    temp_dir: ""
+    chunk_request_timeout: 10s
+    chunk_fetchers: "4"
+```
+
+### Checking if sync is complete
+
+- Query for the node status using the REST or GRPC API
+- Check the `SyncInfo.CatchingUp` field
+- If the field is `false`, then syncing is complete
+
+
+
+
+