Store and display native coin market cap from the DB

[vbaranov]

Resolves #7558

Motivation

Coin market cap cached in memory cache and returned only for the current day currently.

Changelog

Store coin market cap history in the market_history table.

⚠️ Breaking changes for the new frontend:

• api/v2/stats/charts/market endpoint will return market_cap for every json object in the array in chart_data.
• available_supply property will be removed after removing its usage from the frontend (You don't need to calculate market cap on the front based on the available_supply prop anymore).
  ).

Success response body example:

{"chart_data":[{"closing_price":"1723.99","date":"2023-06-20","market_cap":"0.00"},{"closing_price":"1725.87","date":"2023-06-19","market_cap":"207330049476"},{"closing_price":"1720.48","date":"2023-06-18","market_cap":"0.00"},{"closing_price":"1822.91","date":"2023-05-24","market_cap":"0.00"},{"closing_price":"1854.65","date":"2023-05-23","market_cap":"0.00"},{"closing_price":"1817.8","date":"2023-05-22","market_cap":"0.0"}], "available_supply": "100500"}

Checklist for your Pull Request (PR)

• I added an entry to CHANGELOG.md with this PR
• If I added new functionality, I added tests covering it.
• If I fixed a bug, I added a regression test to prevent the bug from silently reappearing again.
• I checked whether I should update the docs and did so by submitting a PR to https://github.com/blockscout/docs
• If I added/changed/removed ENV var, I submitted a PR to https://github.com/blockscout/docs to update the list of env vars at https://github.com/blockscout/docs/blob/master/for-developers/information-and-settings/env-variables.md and I updated the version to master in the Version column. Changes will be reflected in this table: https://docs.blockscout.com/for-developers/information-and-settings/env-variables.
• If I add new indices into DB, I checked, that they are not redundant with PGHero or other tools

[sl1depengwyn]

It seems that here we can use Market.get_coin_exchange_rate() as well

blockscout/apps/block_scout_web/lib/block_scout_web/controllers/api/rpc/stats_controller.ex

Line 65 in cdb42ab

rates = ExchangeRates.lookup(symbol)