feat(drs): add models

[pavelnikonorov]

Add the necessary models for supporting the GA4GH Data Registry Service (DRS) API, version 1.4.0.

This issue requires addressing the following steps:

• Create a ./lib/src/clients/drs folder for the DRS SDK client
• Include DRS in the list of imported modules, the enumerator, and the corresponding as_str method in ./lib/src/clients/mod.rs
• Generate models using the DRS OpenAPI v1.4 specification; refer to the SDK documentation for instructions.
• Manually curate the generated models, ensuring that they are complete and correct; also check the DRS specification for any constraints described in plain text (e.g., in the description properties of the OpenAPI models), as these will generally not be considered during code generation

Additional context

• This issue is part of meta issue feat(drs): add support for the GA4GH DRS API #54. Refer to it for context and additional information.

[lilachic]

There is some incompatibility issue between the generator and the yaml file, given the model generation command, it stopped in error state, add gave a hint to bypass validation. So maybe use in the code a Java class instead of type string 🤔

The error: -attribute tags.description is not of type 'string'

The used command: ./utils/build_models.sh https://raw.githubusercontent.com/ga4gh/data-repository-service-schemas/refs/heads/master/openapi/data_repository_service.openapi.yaml drs lib/src/clients/drs

Work around could be to add the flag --skip-validate-spe to the open API generator openapi-generator-cli generate in the script build_models.sh to generate models. That generates some files.