feat: derive clone for RootedStruct

[baszalmstra]

Derive Clone for RootedStruct. All types contained in the RootedStruct already properly support rooting so this was trivial.

The Clone::clone function for a RootedStruct clones the references to the struct instead of the contents of the struct. Is that desirable? I think so because to me it would make more sense to have to clone the struct itself in Mun and return a new rooted struct.

[codecov]

Codecov Report

Merging #323 (1464216) into master (ba3bdd8) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #323      +/-   ##
==========================================
- Coverage   80.59%   80.59%   -0.01%     
==========================================
  Files         259      259              
  Lines       15561    15561              
==========================================
- Hits        12542    12541       -1     
- Misses       3019     3020       +1     

Impacted Files	Coverage Δ
crates/mun_runtime/src/adt.rs	76.00% <ø> (ø)
crates/mun_memory/tests/diff/util.rs	83.63% <0.00%> (-0.91%)	⬇️

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