feat: allow chd lookups in the hasheous database

[josegonzalez]

Description

Redump CHDs have metadata in the hasheous database.

Checklist
^{Please check all that apply.}

• I've tested the changes locally
• I've updated relevant comments
• I've assigned reviewers for this PR
• I've added unit tests that cover the changes

Screenshots (if applicable)

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Would love to know if there is a good way to add tests for this feature. Doesn't seem like there are any existing tests for this functionality.

[gemini-code-assist]

Summary of Changes

Hello @josegonzalez, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the hasheous database's metadata handling by integrating support for Redump CHD files. By expanding the recognized file extensions for the Dreamcast platform, the system can now correctly identify and manage metadata for games distributed in the CHD format, thereby broadening its compatibility and improving the accuracy of metadata lookups for these titles.

Highlights

• CHD File Support: Enabled the system to recognize and process Redump CHD files by adding 'chd' to the list of acceptable file extensions for the Dreamcast platform within the hasheous metadata handler.

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[gemini-code-assist]

Code Review

This pull request adds support for CHD files for Dreamcast ROM lookups in the Hasheous database, which is a great enhancement. The change is straightforward and correct.

I've added one minor suggestion to keep the list of file extensions sorted for better maintainability.

Regarding your question about testing, you are right that adding tests would be valuable. Since there might not be existing tests for this handler, you could create a new test file, for example, backend/tests/handler/metadata/test_hasheous_handler.py.

A good approach for a unit test would be:

1. Instantiate HasheousHandler.
2. Create a list of mock RomFile objects for the Dreamcast platform, including a .chd file and another file with an extension that should be ignored (e.g., .txt).
3. Use unittest.mock.patch.object to mock the _request method of the handler to prevent actual network calls and return a predefined mock response.
4. Call handler.lookup_rom() with the mock files.
5. Assert that _request was called, which would confirm that the .chd file was correctly filtered and selected for the lookup.

This would ensure the filtering logic works as expected with the new file extension. Great work on this feature!

[gantoine]

a nice, easy fix