docs: add a tutorial to get market data from GMX

[Aviksaikat]

Start with the simple following examples:

• GMX historical price
• TVL
• open interest

Less Relevant

Add examples on how to get the following data form GMX:

• available_markets
• available_liquidity
• borrow_apr
• claimable_fees
• contract_tvl
• get_funding_apr
• gm_price(Token price of GM)
• open_interest
• oracle_prices
• pool_tvl
• GLV stats