Make tagged columnar updates work with mono-components too

[teh-cmc]

• Generate plural methods even for mono-components, so they can be used with send_columns.
• Update scalar_send_columns snippet to use new columnar APIs.

const STEPS: i64 = 64;

let times = TimeColumn::new_sequence("step", 0..STEPS);
let scalars = (0..STEPS).map(|step| (step as f64 / 10.0).sin());

rec.send_columns_v2(
    "scalars",
    [times],
    rerun::Scalar::update_fields()
        .with_many_scalar(scalars)
        .columns(std::iter::repeat(1).take(STEPS as _))?
        .filter(|column| !column.descriptor.component_name.contains("Indicator")),
)?;

• Follow-up to Tagged columnar updates: Rust #8753

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Result	Commit	Link	Manifest
✅	451a848	https://rerun.io/viewer/pr/8769	+nightly +main

^{Note: This comment is updated whenever you push a commit.}

[teh-cmc]

The other languages do not log an indicator here, and for good reasons: indicators in a scalar chunk have huge overhead, and are completely useless as far as I can tell (i.e. they aren't needed for heuristics).

In a follow-up, I will introduce a hardcoded exception so that Scalar::columns just doesn't generate it.

• See also Log indicators in their own dedicated chunks #8768

[teh-cmc]

At least half of the generated code seems to be for blueprint archetypes. We don't need it, I'll add a hardcoded exception to ignore blueprint archetypes tomorrow.

[Wumpf]

lgtm!
We should be able to use this on the image_send_column example. Can you have a look there as well?

[Wumpf]

with_many_scalar is a bit bumpy 🤔
Can't come up with anything better either though. English's 's' pluralization is too imperfect and we don't want to change field names...
Well at least it stands out and the doc string then tells you what's up 👍

[teh-cmc]

lgtm! We should be able to use this on the image_send_column example. Can you have a look there as well?

Ah? will do in the upcoming final clean up pass that removes all the legacy.