Add expand.network aggregated state price adapter (#3467)

Author: AtanasKrondev

.changeset/breezy-hounds-clean.md

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+---
+'@chainlink/expand-network-adapter': minor
+---
+
+Add adapter for expand network.

.pnp.cjs

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+# EXPAND_NETWORK
+
+![0.0.0](https://img.shields.io/github/package-json/v/smartcontractkit/external-adapters-js?filename=packages/sources/expand-network/package.json) ![v3](https://img.shields.io/badge/framework%20version-v3-blueviolet)
+
+This document was generated automatically. Please see [README Generator](../../scripts#readme-generator) for more info.
+
+## Environment Variables
+
+| Required? |      Name       |                   Description                   |  Type  | Options |             Default              |
+| :-------: | :-------------: | :---------------------------------------------: | :----: | :-----: | :------------------------------: |
+|           | WS_API_ENDPOINT | WS endpoint for expand.network price aggregator | string |         | `wss://aggregate.expand.network` |
+|    ✅     |     API_KEY     | An API key for expand.network price aggregator  | string |         |                                  |
+
+---
+
+## Data Provider Rate Limits
+
+There are no rate limits for this adapter.
+
+---
+
+## Input Parameters
+
+| Required? |   Name   |     Description     |  Type  |                      Options                       | Default |
+| :-------: | :------: | :-----------------: | :----: | :------------------------------------------------: | :-----: |
+|           | endpoint | The endpoint to use | string | [price](#price-endpoint), [state](#price-endpoint) | `price` |
+
+## Price Endpoint
+
+Supported names for this endpoint are: `price`, `state`.
+
+### Input Params
+
+| Required? | Name  |    Aliases     |                  Description                   |  Type  | Options | Default | Depends On | Not Valid With |
+| :-------: | :---: | :------------: | :--------------------------------------------: | :----: | :-----: | :-----: | :--------: | :------------: |
+|    ✅     | base  | `coin`, `from` | The symbol of symbols of the currency to query | string |         |         |            |                |
+|    ✅     | quote | `market`, `to` |    The symbol of the currency to convert to    | string |         |         |            |                |
+
+### Example
+
+Request:
+
+```json
+{
+  "data": {
+    "endpoint": "price",
+    "base": "wstETH",
+    "quote": "ETH"
+  }
+}
+```
+
+---
+
+MIT License