feat(1286): Custom fees for fungible tokens

examples/token/token-fixed-fee-hbar.json

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+{
+  "name": "token-fixed-fee-hbar",
+  "symbol": "FFHBAR",
+  "decimals": 8,
+  "supplyType": "finite",
+  "initialSupply": 1000000,
+  "maxSupply": 10000000,
+  "treasuryKey": "<alias or accountId:privateKey>",
+  "adminKey": "<alias or accountId:privateKey>",
+  "memo": "Token with fixed fee paid in HBAR (tinybars)",
+  "customFees": [
+    {
+      "type": "fixed",
+      "amount": 100,
+      "unitType": "HBAR",
+      "collectorId": "<accountId>",
+      "exempt": false
+    }
+  ]
+}

examples/token/token-fixed-fee-token.json

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+{
+  "name": "token-fixed-fee-token",
+  "symbol": "FFTOK",
+  "decimals": 8,
+  "supplyType": "finite",
+  "initialSupply": 1000000,
+  "maxSupply": 10000000,
+  "treasuryKey": "<alias or accountId:privateKey>",
+  "adminKey": "<alias or accountId:privateKey>",
+  "memo": "Token with fixed fee paid in same token units",
+  "customFees": [
+    {
+      "type": "fixed",
+      "amount": 50,
+      "unitType": "TOKEN",
+      "collectorId": "<accountId>",
+      "exempt": false
+    }
+  ]
+}

examples/token/token-fractional-fee-receiver-pays.json

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+{
+  "name": "token-fractional-receiver",
+  "symbol": "FFRECV",
+  "decimals": 8,
+  "supplyType": "finite",
+  "initialSupply": 1000000,
+  "maxSupply": 10000000,
+  "treasuryKey": "<alias or accountId:privateKey>",
+  "adminKey": "<alias or accountId:privateKey>",
+  "memo": "Token with fractional fee (receiver pays, netOfTransfers=false)",
+  "customFees": [
+    {
+      "type": "fractional",
+      "numerator": 1,
+      "denominator": 10,
+      "min": 10,
+      "max": 1000,
+      "netOfTransfers": false,
+      "collectorId": "<accountId>",
+      "exempt": false
+    }
+  ]
+}

examples/token/token-fractional-fee-sender-pays.json

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+{
+  "name": "token-fractional-sender",
+  "symbol": "FFSEND",
+  "decimals": 8,
+  "supplyType": "finite",
+  "initialSupply": 1000000,
+  "maxSupply": 10000000,
+  "treasuryKey": "<alias or accountId:privateKey>",
+  "adminKey": "<alias or accountId:privateKey>",
+  "memo": "Token with fractional fee (sender pays, netOfTransfers=true)",
+  "customFees": [
+    {
+      "type": "fractional",
+      "numerator": 1,
+      "denominator": 10,
+      "min": 10,
+      "max": 1000,
+      "netOfTransfers": true,
+      "collectorId": "<accountId>",
+      "exempt": false
+    }
+  ]
+}