Description

lilconfig is compatible with cosmiconfig, most of our loaders already implemented ourself, we only need the search logic, move yaml/json loader into our codebase also makes them easier to upgrade.

Checklist

• I’ve added tests to confirm my change works.
• (If changing the API or CLI) I’ve documented the changes I’ve made (in the docs/ directory).
• (If the change is user-facing) I’ve added my changes to changelog_unreleased/*/XXXX.md file following changelog_unreleased/TEMPLATE.md.
• I’ve read the contributing guidelines.

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