Add sigHashType for FeeEstimator

[Nanosync]

          `FeeEstimator` doesn't consider `sigHashType` atm, and this `// TODO` has been added to cover that edge case.

Originally posted by @iamcrazycoder in #41 (comment)

[github-actions]

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[github-actions]

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Details

I am a bot created to help the ordzaar developers manage community feedback and contributions. You can check out my manifest file to understand my behavior and what I can do. If you want to use this for your project, you can check out the BirthdayResearch/oss-governance-bot repository.