chore: set CODEOWNERS

[BigLep]

Setting CODEOWNERS as specified in https://app.notion.com/p/filecoindev/FOC-Engineering-Workstreams-342dc41950c1818f99d2e857a7f3cb2e

[BigLep]

@wjmelements@Kubuxu: FYI that you are being made a CODEOWNER in this PR.

Note on CI: the failing check here is pre-existing and unrelated to this change. This PR only adds a .github/CODEOWNERS file, which cannot affect building, testing, linting, or link-checking. Specifically, the build job fails on Solidity linter errors in existing contract sources (e.g. the for (uint256 i = 0; i < permissions.length; i++) loop in the pre-existing code).

[Copilot]

Pull request overview

Adds a GitHub CODEOWNERS file so that ownership/review routing is automatically applied across the repository, aligning with the referenced FOC Engineering Workstreams proposal.

Changes:

• Introduces .github/CODEOWNERS.
• Sets global ownership (*) to the specified GitHub users.

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