fix: Adds client user agent

[moraesjeremias]

Problem

• Coingecko API introduced a request gate that prevents request on empty user-agent

How this was tested

An empty header curl request was made to reproduce the behavior.

╰─$ curl -s "https://api.coingecko.com/api/v3/simple/price?ids=ethereum&vs_currencies=usd&x_cg_api_key=<REDACTED>" -H "user-agent:" | jq .

{
  "status": {
    "error_code": 403,
    "error_message": "Please add a descriptive User-Agent to your request. For higher rate limits & stable integration, please subscribe to our API plans: https://www.coingecko.com/en/api/pricing . If you think this is a mistake, please report here: https://forms.gle/3V2z8Mb3k2RMu5S2A"
  }
}

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[sachiew]

hey, ICYMI, 'x_cg_api_key' is not a valid key parameter, it should be x_cg_demo_api_key (for Demo/Public API): https://docs.coingecko.com/v3.0.1/reference/authentication