### Description
Tracking issue: https://github.com/wormhole-foundation/wormhole-explorer/issues/569
This pull request adds support for the "Base" blockchain in different parts of the codebase:
* The functions `domain.TranslateEmitterAddress`, `domain.EncodeTrxHashByChainID` and `domain.DecodeNativeAddressToHex`.
* The `tx-tracker` service: it now connects to a Base RPC node to fetch origin transaction metadata.