Add stats page

[DimitarSD]

Fixes #355 .

Changes proposed in this PR:

• Adds a new stats page available at /stats

This PR is in some way related to the market-stats PR #4 since the requests are directed to the API endpoints provided by market-stats

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[kremalicious]

for all fetching either use axios or even way better use the useSWR() hook https://swr.vercel.app

[DimitarSD]

I thought we were going to use cross-fetch. I can easily switch to useSWR if needed

[kremalicious]

that is only over on ocean.js. All fetching code in market uses axios, and when using useSWR hook it should use axios too. See the PricesProvider https://github.com/oceanprotocol/market/blob/main/src/providers/Prices.tsx#L46-L50

Where you can then as seen there use the same fetchData() utility method https://github.com/oceanprotocol/market/blob/main/src/utils/index.ts#L43-L55

[mihaisc]

cross-fetch can be used with useSWR, check the graph sync pr. axios has CORS issues when accessing other endpoints. Not sure why stick with it. We already have cross-fetch included for apollo

[DimitarSD]

In that case, it might be better if we update the fetchData function to use cross-fetch instead of axios.

[kremalicious]

Let's revisit after the v4 split as we ant to sprinkle various statistics throughout the whole interface, not just footer