Modify PParams to use similar naming to ProtocolParams in cardano-api

[palas]

Description

This PR modifies FromJSON and ToJSON instances for PParams of all eras so that they match those of ProtocolParams. That way cardano-api can move to use PParams directly.
See the corresponding cardano-api PR.

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

[lehins]

Very much in favor of this change. Few important notes on the PR:

• We need to be careful to preserve JSON serialization of Genesis files
• BoundedRational JSON serialization has been fixed in Fix ToJSON instance of BoundedRatio to avoid precision loss #4058 so we can use it instead doing the conversion to Rational and back everywhere

[lehins]

This looks great. There are only two problems left to resolve. We need some input from @Jimbo4350 for one of them

[Jimbo4350]

Looking good so far. I agree with @lehins wrt not including deprecated protocol parameters. cardano-api incorrectly rendered deprecated protocol parameters.

[lehins]

Looks great. Thank you!