Make PipelineData helpers collect rawstreams

[sophiajt]

Description

Try out having pipelinedata helpers collect rawstreams before they apply functions. This fixes up str trim for me, and might be worth a try for nushell/engine-q#968 and similar.

cc @fdncred

Tests

Make sure you've run and fixed any issues with these commands:

• [x] cargo fmt --all -- --check to check standard code formatting (cargo fmt --all applies these changes)
• [x] cargo clippy --all --all-features -- -D warnings -D clippy::unwrap_used -A clippy::needless_collect to check that you're using the standard code style
• [x] cargo build; cargo test --all --all-features to check that all the tests pass

[kubouch]

@jntrnr This issue sounds related: nushell/nushell#4318

[fdncred]

yes, this fixes nushell/engine-q#968 for me. thanks!

[sophiajt]

Cool, since this seems to be an improvement, I'll go ahead and land.