Scope Cosmos Explorer Support

[avious00]

Now that Trevor's research on scoping Cosmos scraper support in https://github.com/hyperlane-xyz/issues/issues/903 is completed, and implementation issues are in hyperlane-xyz/hyperlane-monorepo#3329, we should figure out what this will take on the Explorer side.

Tasks

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1. Explorer should work with 32-byte addresses from GraphQL queries #61
   explorer +1
   
2. Cosmos message support #80
   cosmos explorer feature +3
3. Cosmos delivery checking #81
   cosmos explorer feature +3
4. Cosmos message debugging #82
   cosmos explorer feature +3
5. Improve test coverage of explorer PI utilities #88
   explorer permissionless tech debt +3

[tkporter]

Flagging this #61 - the scraper atm has been writing 20 byte ethereum-style addresses to the DB which we'll need to change to 32 bytes, the explorer will need to be robust to this

[jmrossy]

@tkporter

Noted thanks

[ameten]

We pay transaction fees on Neutron in NTRN. We receive payment in TIA.