Default preferred locale

[marcospassos]

Summary

This PR introduces a new option for setting a global preferred locale. Previously, developers had to specify the locale for every content fetch call, which was inconvenient. With this update, the application can set the preferred locale during initialization, aligning more closely with how applications typically handle localization.

The previous implementation was SDK-specific, but this change moves support to the content fetcher level, making it more consistent with other default options. Additionally, the option name is being changed from preferredLocale to defaultPreferredLocale to reflect its purpose more accurately. Note that this is a breaking change.

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

[pkg-pr-new]

commit: eb737c3

npm i https://pkg.pr.new/@croct/sdk@422

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[codeclimate]

Code Climate has analyzed commit eb737c3 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 99.9% (0.0% change).

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