feat(Containers.Option): add computation expression builder

```fsharp
module Option =
type Builder() =
member __.Bind(x, f) =
Option.bind f x
member __.Return x = Some x
member __.ReturnFrom x = x

let builder = Builder()
```

Start with the repository's existing Containers.Option module and inspect how similar computation expression builders are organized. Implement the builder and members shown in the issue, then run the repository's available build or test command to confirm the Option computation expression is usable.

Written by the indexing model from the issue text.