add indexergw package

packages/indexergw/CHANGELOG.md

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+# @0xsequence/indexergw
+
+## 1.0.0
+
+### Initial Release
+
+- Initial release of the Indexer Gateway

packages/indexergw/README.md

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+@0xsequence/indexer
+===================
+
+See [0xsequence project page](https://github.com/0xsequence/sequence.js).

packages/indexergw/package.json

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+{
+  "name": "@0xsequence/indexergw",
+  "version": "2.1.6",
+  "description": "indexergw sub-package for Sequence",
+  "repository": "https://github.com/0xsequence/sequence.js/tree/master/packages/indexergw",
+  "source": "src/index.ts",
+  "main": "dist/0xsequence-indexergw.cjs.js",
+  "module": "dist/0xsequence-indexergw.esm.js",
+  "author": "Horizon Blockchain Games",
+  "license": "Apache-2.0",
+  "scripts": {
+    "test": "echo",
+    "typecheck": "tsc --noEmit"
+  },
+  "dependencies": {},
+  "peerDependencies": {},
+  "devDependencies": {},
+  "files": [
+    "src",
+    "dist"
+  ]
+}

packages/indexergw/src/index.ts

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+export * from './indexergw.gen'
+
+import { IndexerGateway as IndexerGatewayRpc } from './indexergw.gen'
+
+const fetch = globalThis.fetch
+
+export class SequenceIndexerGateway extends IndexerGatewayRpc {
+  constructor(
+    hostname: string,
+  ) {
+    super(hostname.endsWith('/') ? hostname.slice(0, -1) : hostname, fetch)
+    this.fetch = this._fetch
+  }
+
+  _fetch = (input: RequestInfo, init?: RequestInit): Promise<Response> => {
+    // no additional headers for now, but we might add some later
+    const headers: { [key: string]: any } = {}
+
+    init!.headers = { ...init!.headers, ...headers }
+
+    return fetch(input, init)
+  }
+}