Implement Oracle in replacement of CoinGecko

[JSKitty]

Abstract

This PR integrates Labs Oracle, our in-house price aggregation system, in full replacement of our current "generic" MarketSource system that we implemented CoinGecko with, this integration grants a couple benefits:

• Much more efficient, dropping each refresh request from ~45kb to a one-time 4kb and per-call ~60 bytes.
• More currencies: Oracle can aggregate from any source on behalf of MPW, forever extending our currency options.
• Standardised and Open-Source, unlike CoinGecko, many Oracles can be hosted, each with the same API interface, for better privacy and decentralisation, as well as removing a proprietary API from MPW.
• Just more reliable: CoinGecko frequently limits their public APIs, and sometimes they just outright fail, Oracle is stable.

Rather than spending time integrating various external price sources alongside CoinGecko - which is time consuming, cumbersome, and harder on MPW maintainers, this PR proposes a standardised price API schema, which MPW and all other Labs projects will adopt.

Oracle has the same - and even more - currencies than CoinGecko, so no user options will be affected by this, all of their regular currencies will continue to display as expected.

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Testing

To test this PR, it's suggested to attempt these user flows, or variations of these:

• Check your settings, ensure MPW and Oracle use your chosen currency and that it changes and refreshes successfully.
• Check your balances, make sure the price loads and updates accordingly.
• (Devs Only) check that the cache system works as expected, only doing a single "heavy" request, with smaller subsequent requests.

If any errors are found, the PR works unexpectedly, or you have viable suggestions to improve the UX or functionality of the PR, let me know!

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[Duddino]

tACK

[panleone]

Seems to work but there are some code changes I'd like to see before merging

[panleone]

tACK working as expected and bandwidth is reduced