Add agat sq stat basic

[Leila011]

Description

add agat_sq_stat_basic

Issue ticket number

Closes #xxxx

Checklist before requesting a review

• [x] I have performed a self-review of my code

• [x] Conforms to the Contributing guidelines

• [x] Proposed changes are described in the CHANGELOG.md

• [x] I have tested my code with viash ns test --parallel -q <name or namespace>

• Check the correct box. Does this PR contain:

  • [ ] Breaking changes
  • [x] New functionality
  • [ ] Major changes
  • [ ] Minor changes
  • [ ] Documentation
  • [ ] Bug fixes

[Leila011]

Questions:

1. Did I handled the situation with the argument --genome correctly: this argument can have both type file and integer. So I created two arguments, one for each type.
2. Should those arguments (`genome_size and genome_size_fasta) be in the section Input and have the tag direction = input .