GateIO: Split futures into USDTM and CoinM futures (#1786)

* Config: v5 Split GateIO futures into CoinM and USDT

* GateIO: Split asset.Futures into CoinM and USDT

* Fix CancelBatchOrders using wrong endpoint for CoinMarginedFutures
* Fix TestGetActiveOrders expecting currency.ErrCurrencyPairsEmpty

* Config: Add config version continuity step to CI

* GateIO: Pin CoinM futures to just BTC/USD

Right now we only have a /btc endpoint available, and only BTCUSD is
available.
If GateIO offers more, we'll need to add a settlement currencies list
again

.github/workflows/config-versions-lint.yml

@@ -0,0 +1,16 @@
+name: configs-versions-lint
+on: [push, pull_request]
+env:
+  GO_VERSION: 1.24.x
+jobs:
+  lint:
+    name: config versions lint
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Setup Go
+      uses: actions/setup-go@v5
+      with:
+        go-version: ${{ env.GO_VERSION }}
+    - name: Check config versions are continuous
+      run: go test ./config/versions/ -tags config_versions -run Continuity