Scraper sealevel support: fully implement `HyperlaneProvider` for `SealevelProvider`

[tkporter]

• fully implement impl HyperlaneProvider for SealevelProvider, which atm has a bunch of todo!()s because those paths aren't used by the relayer or validator: https://github.com/hyperlane-xyz/hyperlane-monorepo/blob/cf6816be7fc567b91b99c0567edee3628a05a808/rust/chains/hyperlane-sealevel/src/provider.rs#L63

This will be more thoroughly tested by subsequent work in e2e https://github.com/hyperlane-xyz/hyperlane-monorepo/issues/4273. I'd say the success criteria here can be a bit looser with the understanding that any bugs here will have an impact on 4273, and we can use 4273 as the way to test the changes here