feat(): add samples & missing endpoints for spot leverage token and spot margin

examples/apidoc/V5/Spot-Margin-Trade-(UTA)/README.md

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+# V5 - REST - Spot Margin Trade (UTA)
+
+https://bybit-exchange.github.io/docs/v5/spot-margin-uta/switch-mode

examples/apidoc/V5/Spot-Margin-Trade-(UTA)/set-leverage.js

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+const { RestClientV5 } = require('bybit-api');
+
+const client = new RestClientV5({
+  testnet: true,
+  key: 'apikey',
+  secret: 'apisecret',
+});
+
+client
+  .setSpotMarginLeverage('4')
+  .then((response) => {
+    console.log(response);
+  })
+  .catch((error) => {
+    console.error(error);
+  });

examples/apidoc/V5/Spot-Margin-Trade-(UTA)/toggle-margin-trade.js

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+const { RestClientV5 } = require('bybit-api');
+
+const client = new RestClientV5({
+  testnet: true,
+  key: 'apikey',
+  secret: 'apisecret',
+});
+
+client
+  .toggleSpotMarginTrade('0')
+  .then((response) => {
+    console.log(response);
+  })
+  .catch((error) => {
+    console.error(error);
+  });