feat: add asset mapping

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.08 :tada:

Comparison is base (6d20ec4) 91.34% compared to head (1668764) 91.42%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #103 +/- ## ========================================== + Coverage 91.34% 91.42% +0.08% ========================================== Files 34 34 Lines 2647 2672 +25 Branches 407 413 +6 ========================================== + Hits 2418 2443 +25 Misses 229 229 ``` | [Impacted Files](https://codecov.io/gh/BendDAO/bend-lending-protocol/pull/103?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BendDAO) | Coverage Δ | | |---|---|---| | [contracts/protocol/NFTOracle.sol](https://codecov.io/gh/BendDAO/bend-lending-protocol/pull/103?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BendDAO#diff-Y29udHJhY3RzL3Byb3RvY29sL05GVE9yYWNsZS5zb2w=) | `97.80% <100.00%> (+0.34%)` | :arrow_up: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BendDAO). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BendDAO)

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