feat(api): Add include_transactions parameter to the BlockAtHeightResource

[msbrogli]

Motivation

Some use cases can benefit from getting the list of transactions confirmed by a block, facilitating internal tasks and reducing the number of API calls.

Acceptance Criteria

1. Add include_transactions: str | None to BlockAtHeightResource.render_GET.
2. If include_transactions == "txid", the response will have a new key tx_ids: list[str] with a list of tx ids in hex format.
3. If include_transactions == "full", the response will have a new key transactions: list[dict] with a list of tx details got from tx.to_json_extended().
4. Refactor argument parser to use QueryParams.

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[codecov]

Codecov Report

Attention: Patch coverage is 97.14286% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 84.93%. Comparing base (398ccd7) to head (8e9bfbc).
Report is 4 commits behind head on master.

Files	Patch %	Lines
hathor/transaction/resources/block_at_height.py	96.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1046      +/-   ##
==========================================
- Coverage   84.97%   84.93%   -0.04%     
==========================================
  Files         297      297              
  Lines       22917    22927      +10     
  Branches     3466     3470       +4     
==========================================
  Hits        19473    19473              
- Misses       2763     2768       +5     
- Partials      681      686       +5     

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