Flexible costmodel params

[lehins]

Description

Fixes in this PR:

• Pump up to Plutus 1.27
• Revert changes in 508f091 due to accidental change in Plutus: Kwxm/costing/restore old cost model param names plutus#5932
• Change type for CostModel parameters to Int64 instead of Integer. See an accompanied change in plutus: Use Int64 in CostModelParams plutus#5920
• Fixes Problematic cost model serialization #2902 by allowing variable number of cost model parameters once we are in Conway. See relevant change on the plutus side: Change CMTooFewParamsError to a warning plutus#5912

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

[neilmayhew]

So far all I've seen is this typo

[neilmayhew]

This looks good to me, and I think I understand the changes well enough.

I've made a minor suggestion for improving the wording of a comment, but feel free to ignore this if you don't want to delay merging.