Add celo fee.estimateFeePerGas

[shazarre]

Overview

This PR introduces custom Celo fee estimation for cases when feeCurrency is used to send a transaction.

Other changes

It also introduces a fallback behaviour of the custom estimation logic.

Tested

• Introduced new unit tests and adapted existing ones.
• Tested for different fee currencies (as well as without it) on alfajores

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PR-Codex overview

This PR adds a custom Celo fees estimation function for transactions with feeCurrency. It also refactors ChainEstimateFeesPerGasFn and updates related tests.

Detailed summary

• Added custom fees estimation function for feeCurrency transactions in Celo
• Refactored ChainEstimateFeesPerGasFn in chain.ts
• Updated tests for estimateFeesPerGas
• Added new functions for estimating fees in fees.ts

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🦋 Changeset detected

Latest commit: a297a50

The changes in this PR will be included in the next version bump.

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