feat: integrate with Euler V2 vaults

[xenide]

Motivation

We need to integrate our AMM with Euler instead of AAVE, since we will be supplying our assets there.

Outstanding items:

• handle pause / frozen cases for euler
  • not handling, in line with how we integrated with aave previously
• integrate additional rewards
• track total shares and only allow the admin to set another vault when the totalShares is 0

Solution

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.76%. Comparing base (69c7c52) to head (c1a6373).
Report is 3 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #231      +/-   ##
==========================================
- Coverage   88.04%   85.76%   -2.29%     
==========================================
  Files          12       24      +12     
  Lines         619      899     +280     
==========================================
+ Hits          545      771     +226     
- Misses         74      128      +54     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[OliverNChalk]

Some small comments so far. Really good looking code, hard to find things to complain about haha