Update IGP gas oracles with new heuristics, get Cosmos gas prices from registry

[tkporter]

Description

The original and main motivation of this PR was to feel confident when running deploy.ts -m igp off of main. Prior to this, running it off main could result in misconfiguring gas oracles, particularly when it came to non-EVM remotes. See https://github.com/hyperlane-xyz/issues/issues/1178 for some context.

This PR does a number of things:

• Fetches Cosmos gas prices from the Cosmos registry
• the gasPrices.json now lets you specify the decimals relating to the amount in there. There are 2 reasons for this: it's easier for us to deal with gwei values for EVM chains (as we often end up manually changing these instead of just relying on the script). The second reason is covered in the next bullet
• Handles decimals when it comes to gas prices. The existing tooling assumed gas prices would always be denominated in wei. An extra weird situation arises with non-EVM chains: chains like Neutron have gas prices that are quotes in the smallest denomination (ie the equivalent of "wei" for NTRN), but the gas price is not an integer and is very small, e.g. 0.0053. This poses issues because the IGP contracts require the gas price that's configured onchain to be an integer. Simply rounding up from 0.0053 to 1 results in almost 2 orders of magnitude difference :(. So the solution here is to have some logic that accommodates really tiny gas prices by scaling up the configured gas price and scaling down the configured token exchange rate.
• Applies some "non-linear" gas pricing heuristics. See https://github.com/hyperlane-xyz/issues/issues/1204 and https://discord.com/channels/935678348330434570/935678739663192184/1232293417309044818 for some context
• Running update-agent-config.ts will fetch gas prices for Cosmos chains from the Cosmos registry and ensure they're accurate

Drive-by changes

Some logging messages when applying IGP gas oracle changes to make it more clear what the change actually does

Related issues

• Fixes Lower Neutron gas prices used by relayer #3386
• Fixes Accommodate non-standard native token decimals in IGP storage oracles #3484
• Fixes https://github.com/hyperlane-xyz/issues/issues/1178
• Fixes https://github.com/hyperlane-xyz/issues/issues/1206
• Fixes https://github.com/hyperlane-xyz/issues/issues/1204

Backward compatibility

Fully backward compatible

Testing

Ran deploy.ts for the IGP on all chains!

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.28%. Comparing base (d6f25ed) to head (e174780).
Report is 1 commits behind head on main.

Additional details and impacted files

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