Port all? command (#365)

* Implement `From<bool>` for `Value`

* Add `All` command

* Change `IntoPipelineData` and `IntoInterruptiblePipelineData` bounds

* Refactor `PipelineIterator` impls

* Add `PipelineData::into_interruptible_iter`

* Use `into_interruptible_iter` instead of `all` helper

* Merge imports

* Refactor `PipelineData::{filter, map}`

* Change comment pronoun

* Treat `RowCondition` as a block

* Remove unnecessary braces

* Address cluppy warning

crates/nu-command/src/default_context.rs

@@ -20,6 +20,7 @@ pub fn create_default_context() -> EngineState {
         // TODO: sort default context items categorically
         bind_command!(
             Alias,
+            All,
             Append,
             Benchmark,
             BuildString,