chore: refactor tests folder structure

[bigint]

• chore: refactor tests folder structure
• chore: add lint and typecheck commands

What does this PR do?

🤖 Generated by Copilot at 4b12710

This pull request adds typescript and eslint support for the tests package and renames the test files to match the source structure. It also updates the root pnpm-lock.yaml file to include typescript as a dependency.

Related issues

Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Enhancement (non-breaking small changes to existing functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Explanation of the changes

🤖 Generated by Copilot at 4b12710

• Add typescript support for the lenster project (link, link, link)
• Convert tests from javascript to typescript and move them to a new directory (link, link, ..., link)

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