[FEATURE] Handle multiple citations

[eseiler]

Resolves #196

Notes:

• We could keep citation (no deprecation)
• We could make citation something like (no API change):

  class stringy : public std::vector<std::string>
  {
      stringy(std::string str) : stringy({std::move(str)})
      // ...
  }

Before

    In your academic works please cite: (1) Raptor: A fast and space-efficient
    pre-filter for querying very large collections of nucleotide sequences;
    Enrico Seiler, Svenja Mehringer, Mitra Darvish, Etienne Turc, and Knut
    Reinert; iScience 2021 24 (7): 102782. doi:
    https://doi.org/10.1016/j.isci.2021.102782 (2) Hierarchical Interleaved
    Bloom Filter: enabling ultrafast, approximate sequence queries;Svenja
    Mehringer, Enrico Seiler, Felix Droop, Mitra Darvish, René Rahn, Martin
    Vingron, and Knut Reinert; Genome Biol 24, 131 (2023). doi:
    https://doi.org/10.1186/s13059-023-02971-4 (3) Hello Foo Bar

After

    In your academic works please cite:
    [1]   Raptor: A fast and space-efficient pre-filter for querying very
          large collections of nucleotide sequences; Enrico Seiler, Svenja
          Mehringer, Mitra Darvish, Etienne Turc, and Knut Reinert; iScience
          2021 24 (7): 102782. doi: https://doi.org/10.1016/j.isci.2021.102782
    [2]   Hierarchical Interleaved Bloom Filter: enabling ultrafast,
          approximate sequence queries;Svenja Mehringer, Enrico Seiler, Felix
          Droop, Mitra Darvish, René Rahn, Martin Vingron, and Knut Reinert;
          Genome Biol 24, 131 (2023). doi:
          https://doi.org/10.1186/s13059-023-02971-4
    [3]   Hello Foo Bar

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.37%. Comparing base (cb13c0c) to head (875b93b).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #280      +/-   ##
==========================================
+ Coverage   94.34%   94.37%   +0.03%     
==========================================
  Files          19       20       +1     
  Lines        1628     1637       +9     
  Branches       47       47              
==========================================
+ Hits         1536     1545       +9     
  Misses         92       92              

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[seqan-actions]

Documentation preview available at https://docs.seqan.de/preview/seqan/sharg-parser/280