[TM-39] Hide `cp` type parameter

Description

Problem: cp parameter is everywhere in the code. It's caused due to SELF instruction.

Solution: just remove this type parameter. Pass to SELF contract parameter stored in TypeCheckT.

Implemented over jcb/tm29 branch. Please don't merge until jcb/tm29 is merged. Will be rebased onto master when jcb/tm29 is merged.

Related issue(s)

https://issues.serokell.io/issue/TM-39

✅ Checklist for your Merge Request

Related changes (conditional)

• Tests

  • If I added new functionality, I added tests covering it.
  • If I fixed a bug, I added a regression test to prevent the bug from silently reappearing again.

• Documentation

  • I checked whether I should update the docs and did so if necessary:
    • README
    • Haddock

Stylistic guide (mandatory)

• My commits comply with the following policy.
• My code complies with the style guide.