Rename package to durable-workflow/workflow

[rmcdaniel]

Summary

• Rename the Composer package from `laravel-workflow/laravel-workflow` to `durable-workflow/workflow`.
• Add a `replace` clause so the old name keeps resolving for existing consumers during the transition.
• PHP namespace (`Workflow\`) is unchanged — decoupled from the package name.

Follow-ups (out of scope)

• README badges / install snippets
• Packagist: submit new package, mark old one abandoned pointing to the new name
• Lockfile regeneration in downstream consumers (blocked on new name being published)

Test plan

• `composer validate` passes
• Consumers using old name still resolve via `replace`
• Consumers using new name resolve from Packagist once published

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