deer: implement Deserialize for core::marker

[indietyp]

🌟 What is the purpose of this PR?

Implements Deserialize for:

• core::marker::PhantomData

Does not implement Deserialize for core::marker::PhantomPinned, reason being that PhantomPinned is only really used for types that implement Future, those are unlikely to be deserialized (also serde does not implement it)

Taken from #1875 in an effort to make PRs smaller

🔗 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

Attention: Patch coverage is 38.88889% with 11 lines in your changes missing coverage. Please review.

Project coverage is 60.68%. Comparing base (7633fdd) to head (ea7d81c).
Report is 2813 commits behind head on main.

Files with missing lines	Patch %	Lines
libs/deer/src/impls/core/marker.rs	38.88%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2379      +/-   ##
==========================================
- Coverage   60.69%   60.68%   -0.02%     
==========================================
  Files         317      318       +1     
  Lines       24279    24297      +18     
  Branches      421      421              
==========================================
+ Hits        14737    14744       +7     
- Misses       9537     9548      +11     
  Partials        5        5              

Flag	Coverage Δ
backend-integration-tests	3.66% <ø> (ø)
deer	69.09% <38.88%> (-0.15%)	⬇️
unit-tests	1.49% <ø> (ø)

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