Add josh-sync repository

[Kobzol]

This repository will host Rust code and GitHub Actions workflows for synchronizing Josh subtrees from/into rust-lang/rust.

[github-actions]

Dry-run check results

[WARN  sync_team] sync-team is running in dry mode, no changes will be applied.
[INFO  sync_team] synchronizing github
[INFO  sync_team] 💻 Repo Diffs:
    ➕ Creating repo:
      Org: rust-lang
      Name: josh-sync
      Description: Utilities for synchronizing Josh subtrees to the Rust compiler repo
      Homepage: None
      Auto-merge: true
      Permissions:
        Giving team 'infra' write permission
        Giving team 'compiler' write permission
      Branch Protections:
        main
            Dismiss Stale Reviews: false
            Is admin enforced: true
            Required Approving Review Count: 0
            Requires PR: true
            Required Checks: []
            Allowances: []

[Kobzol]

I also added access for t-compiler, as the tooling is used for syncing code between the Rust compiler repo and its subtrees.