feat: integrate coingecko api in pricing routes

[onyb]

Example request:

curl -X 'POST' \
  'http://127.0.0.1:8000/api/pricing/v1/getPrices?vs_currency=usd' \
  -H 'accept: application/json' \
  -H 'Content-Type: application/json' \
  -d '[
  {
    "address": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
    "chain_id": "0x1",
    "coin_type": "ETH"
  },
  {
    "address": "0xaf88d065e77c8cc2239327c5edb3a432268e5831",
    "chain_id": "0xa4b1",
    "coin_type": "ETH"
  },
  {
    "coin_type": "BTC"
  },
  {
    "coin_type": "BTC"
  },
  {
    "coin_type": "ADA"
  }
]
'

Example response:

[
  {
    "coin_type": "BTC",
    "chain_id": null,
    "address": null,
    "price": 104364,
    "vs_currency": "usd",
    "cache_status": "MISS"
  },
  {
    "coin_type": "ADA",
    "chain_id": null,
    "address": null,
    "price": 0.672391,
    "vs_currency": "usd",
    "cache_status": "MISS"
  },
  {
    "coin_type": "ETH",
    "chain_id": "0x1",
    "address": "0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48",
    "price": 0.9998,
    "vs_currency": "usd",
    "cache_status": "MISS"
  },
  {
    "coin_type": "ETH",
    "chain_id": "0xa4b1",
    "address": "0xaf88d065e77c8cc2239327c5edb3a432268e5831",
    "price": 0.9998,
    "vs_currency": "usd",
    "cache_status": "MISS"
  }
]

Executing the request again, partially or otherwise, results in cache HIT.

[Douglashdaniel]

LGTM!