Closes TOOL-3699

PR-Codex overview

This PR introduces a new Token_Price class for handling token price data and updates the ThirdwebInsight class with methods to fetch token prices from an API. It also adds commented-out example code for retrieving and displaying token prices in the console application.

Detailed summary

• Added Token_Price class with properties: ChainId, Address, Symbol, PriceUsd, PriceUsdCents, and a ToString method.
• Implemented GetTokenPrice method in ThirdwebInsight to fetch a single token price.
• Implemented GetTokenPrices method in ThirdwebInsight to fetch multiple token prices.
• Added commented-out code in Program.cs for fetching and displaying token prices.

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