## Problem solved
Short description of the bug fixed or feature added
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## PR-Codex overview
This PR adds `parseAvatarRecord` and `parseNftUri` utilities for ENS avatars and NFT URIs. Detailed summary:
### Detailed summary
- Added `parseAvatarRecord` and `parseNftUri` functions for ENS avatars and NFT URIs
- Updated `common.ts` and `ens.ts` with new exports
- Created `parseNftUri` function in `parseNft.ts`
- Added `parseAvatarRecord` function in `avatar.ts`
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