avalanche: add firewood profile for mainnet (pruning-free merkle DB)

Add new avalanchego v1.14.2 profile with Firewood state database backend:
- state-scheme: firewood (with required populate-missing-tries:null, snapshot-cache:0)
- state-sync-enabled: true (confirmed supported in v1.14.2)
- chain-config-dir: /config/firewood
- db-type: firewood
- coreth-state-scheme: firewood

Generated compose: avalanche-mainnet-go-firewood-firewood.yml

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

avalanche/mainnet/firewood/C/config.json

@@ -0,0 +1,24 @@
+{
+    "snowman-api-enabled": false,
+    "coreth-admin-api-enabled": false,
+    "net-api-enabled": true,
+    "rpc-gas-cap": 2500000000,
+    "rpc-tx-fee-cap": 100,
+    "eth-rpc-gas-limit": 2500000000,
+    "eth-api-enabled": true,
+    "personal-api-enabled": false,
+    "tx-pool-api-enabled": false,
+    "debug-api-enabled": false,
+    "web3-api-enabled": true,
+    "local-txs-enabled": false,
+    "pruning-enabled": false,
+    "api-max-duration": 0,
+    "api-max-blocks-per-request": 0,
+    "allow-unfinalized-queries": false,
+    "log-level": "info",
+    "state-sync-enabled": true,
+    "state-sync-skip-resume": true,
+    "state-scheme": "firewood",
+    "populate-missing-tries": null,
+    "snapshot-cache": 0
+}