deer: implement Deserialize for core::cell

[indietyp]

🌟 What is the purpose of this PR?

This is an "explosion" of #1875 and implements Deserialize for:

• core::cell::Cell
• core::cell::RefCell
• core::cell::UnsafeCell
• core::cell::OnceCell
• core::cell::SyncUnsafeCell

🔗 Related links

• GEN-160: deer type implementation #1700
• deer implement Deserialize for built-in types (Part 2)  #1875

🔍 Has this modified a publishable library?

This PR:

• modifies an npm-publishable library and I have added a changeset file(s)
• modifies a Cargo-publishable library and I have amended the version
• modifies a Cargo-publishable library, but it is not yet ready to publish
• modifies a block that will need publishing via GitHub action once merged
• does not modify any publishable blocks or libraries
• I am unsure / need advice

[codecov]

Codecov Report

Merging #2376 (09103a4) into main (7633fdd) will increase coverage by 0.02%.
The diff coverage is 89.65%.

@@            Coverage Diff             @@
##             main    #2376      +/-   ##
==========================================
+ Coverage   60.69%   60.72%   +0.02%     
==========================================
  Files         317      317              
  Lines       24279    24275       -4     
  Branches      421      421              
==========================================
+ Hits        14737    14741       +4     
+ Misses       9537     9529       -8     
  Partials        5        5              

Flag	Coverage Δ
backend-integration-tests	3.66% <ø> (ø)
deer	69.36% <89.65%> (+0.12%)	⬆️
unit-tests	1.49% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
libs/deer/desert/src/lib.rs	100.00% <ø> (ø)
libs/deer/src/lib.rs	73.80% <ø> (ø)
libs/deer/src/impls/core/cell.rs	62.50% <62.50%> (ø)
libs/deer/desert/src/assert.rs	100.00% <100.00%> (ø)

... and 9 files with indirect coverage changes

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