[#902] Deprecate OPEN_CHEST

Discussion point: the fact of the matter is, despite what the tezos changelog says, chest_key and chest types are also deprecated. However, we don't have a mechanism to deprecate those in morley. I don't really think we need one, and we can just leave things be, but I'm open to suggestions.

UPDATE: types are explicitly "banned" in 0b5f2490, but arguably that is a giant ugly hack.

Description

Problem: In Lima, OPEN_CHEST is deprecated.

Solution: Do likewise in our code. Additionally, forbid typechecking OPEN_CHEST instruction and chest and chest_key values in strict tc mode.

NB: AnnOPEN_CHEST and untyped OPEN_CHEST are purposefully left un-deprecated to avoid proliferation of -Wno-deprecations everywhere. The rationale is that untyped OPEN_CHEST needs to be typechecked, and that will fail in strict mode, and AnnOPEN_CHEST is not intended to be user-facing, so it's assumed the user knows what they're doing if using AnnOPEN_CHEST directly.

Related issue(s)

Resolves #902 (closed)

✅ Checklist for your Merge Request

Related changes (conditional)

• Tests (see short guidelines)

  • 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:
    • Root README and other README.md files
    • Haddock
    • docs/
  • I updated changelog files of all affected packages released to Hackage if my changes are externally visible.

Stylistic guide (mandatory)

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