Contract size improvements

[prat-gpt]

Description

• Remove the _determineInflatorState method and add the method logic into the Pool contract.
• Remove the _getCollateralDustPricePrecisionAdjustment method and add the method logic into the ERC20Pool contract.
• Update the getExchangeRate method visibility in the Buckets library to external as that was only called inside the bucketExchangeRate method in the Pool contract which is a view method.

Purpose

• PR aims to reduce contract size to accommodate contract changes that may occur in the future.

Impact

• ERC721 contract size reduced from 24,540B (99.85%) to 24,329B (98.99%).
• ERC20 contract size reduced from 23,597B (96.01%) to 23,375B (95.11%).

Tasks

• Changes to protocol contracts are covered by unit tests executed by CI.
• Protocol contract size limits have not been exceeded.
• Gas consumption for impacted transactions have been compared with the target branch, and nontrivial changes cited in the Impact section above.
• Scope labels have been assigned as appropriate.
• Invariant tests have been manually executed as appropriate for the nature of the change.

[prat-gpt]

Updating getExchangeRate method visibility to external created inconsistency in Buckets Library but is only called in view method in Pool contract.

[ith-harvey]

Even though this really just looks like simple copy paste of moving different parts of the program around I am reluctant to make this change as close as we are to deployment.

If we had another 4 days of invariant runs ahead of us before deploying to mainnet I would say fine but I think its too big a risk to make src changes like this without the invariant testing to back it up.

I'm of the opinion that we leave it in it's PR form now then if we ever need the extra contract space we can add it.