Add estimateMinFeeTx

[lehins]

Description

Current version of the function evaluateTransactionFee does not handle Byron witnesses and it is not recursive, so it cannot account for the fact that occasionally the change to the fee will affects the size of the transaction and thus the minimum fee. New estomateMinFeeTx improves this logic

Besides adding this new functionality to ledger API there are a few minor additions:

• Addition of forceDRepPulsingState, which can be used to memoize the result of a premature completion of DRep pulser
• Addition of Arbitrary instances for bootstrap addresses and ByronKeyPair type that can be used to test functionality related to Byron addresses and witnesses
• Adds Enc/DecCBOR instances for SignedDSIGN

Checklist

• Commit sequence broadly makes sense and commits have useful messages
• New tests are added if needed and existing tests are updated
• When applicable, versions are updated in .cabal and CHANGELOG.md files according to the
  versioning process.
• The version bounds in .cabal files for all affected packages are updated. If you change the bounds in a cabal file, that package itself must have a version increase. (See RELEASING.md)
• All visible changes are prepended to the latest section of a CHANGELOG.md for the affected packages. New section is never added with the code changes. (See RELEASING.md)
• Code is formatted with fourmolu (use scripts/fourmolize.sh)
• Cabal files are formatted (use scripts/cabal-format.sh)
• hie.yaml has been updated (use scripts/gen-hie.sh)
• Self-reviewed the diff

[Soupstraw]

LGTM

[Soupstraw]

We should also use this in the fixup function of ImpTest

[teodanciu]

Looks good to me