Draft- Opinions needed. Changed the STS State of the UTXO, UTXOW, and DELEGS rules

[TimSheard]

Changed the STS State of the UTXO, UTXOW, and DELEGS rules. From UTxOState to LedgerState, for UTXO and UTXOW and from DPState to LedgerState. for DELEGS.
This is an experiment. When we move to incremental computation of the distribution maps, any place that alters
one of the roots of the incremental computations, will need access to all the roots. Since we currently alter the roots
in several different STS rules, all these rules need the same STS state. That is the motivation to make LedgerState
a common STS state for all of them.

• Commit sequence broadly makes sense and commits have useful messages
• New tests are added if needed and existing tests are updated
• Any changes are noted in the CHANGELOG.md for affected package
• 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