Add dummy serde and reexport MerkleHasherLifted.

[leo-starkware]

These changes make it easier to integrate with stwo_cairo_prover.

[reviewable-StarkWare]

This change is 

[leo-starkware]

• Add dummy serde and reexport MerkleHasherLifted. #1297 👈 (View in Graphite)
• Fix lifting size in fri_answers and add test. #1296
• Add periodicity samples. #1294
• Change queried values layout. #1293
• Change order of the alphas to the samples order. #1292
• lifted

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 11 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.06%. Comparing base (c36cf05) to head (9b99d1b).

Files with missing lines	Patch %	Lines
crates/stwo/src/core/vcs_lifted/blake2_merkle.rs	0.00%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           lifted    #1297      +/-   ##
==========================================
- Coverage   92.13%   92.06%   -0.07%     
==========================================
  Files         119      119              
  Lines       15059    15070      +11     
  Branches    15059    15070      +11     
==========================================
  Hits        13874    13874              
- Misses       1096     1107      +11     
  Partials       89       89              

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