[DONT MERGE BEFORE Uniswap and Network] - Token price caching

[Corantin]

• Fetch token price only once to limit calls to the API
• Cache is only loaded until refresh of the page
• Implement some tests for fetching dashboard info
• Refactor quest subgraph queries to make them mockable
• Fix the total funds
  Before :
  

After :

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[codecov]

Codecov Report

Merging #226 (9545f7a) into fix-uniswap-and-network (7b9148c) will not change coverage.
The diff coverage is n/a.

❗ Current head 9545f7a differs from pull request most recent head bb9531b. Consider uploading reports for the commit bb9531b to get more accurate results

@@                    Coverage Diff                    @@
##           fix-uniswap-and-network      #226   +/-   ##
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  Coverage                   100.00%   100.00%           
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  Files                            2         2           
  Lines                           25        25           
  Branches                         5         5           
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  Hits                            25        25           

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[kamikazebr]

Awesome improvment!! <3