API: TVL in native and USD

[aoikurokawa]

• TVL for each vault in native unit and $

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 246 lines in your changes missing coverage. Please review.

Project coverage is 78.63%. Comparing base (c736bca) to head (23e6507).

Files with missing lines	Patch %	Lines
api/src/router/vaults/tvl.rs	0.00%	108 Missing ⚠️
api/src/error.rs	0.00%	61 Missing ⚠️
api/src/router/vaults/vault.rs	0.00%	41 Missing ⚠️
api/src/bin/main.rs	0.00%	21 Missing ⚠️
api/src/router/mod.rs	0.00%	15 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #199      +/-   ##
==========================================
- Coverage   80.70%   78.63%   -2.07%     
==========================================
  Files          91       96       +5     
  Lines        9944    10190     +246     
==========================================
- Hits         8025     8013      -12     
- Misses       1919     2177     +258     

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