docs: deprecate SensorDataSeries and SensorDataSeriesList for removal in v4.0.0

[jdsika]

Summary

Deprecates SensorDataSeries and SensorDataSeriesList in osi_datarecording.proto with \attention notes indicating removal in OSI 4.0.0.

Motivation

As discussed in #900, these messages predate the OSI trace file formats and have been fully superseded:

Deprecated message	Superseded by	Why
SensorDataSeries	Single-channel .osi trace format	Generalizes to any top-level message type; supports streaming without loading all timesteps into memory
SensorDataSeriesList	Multi-channel .mcap trace format	Generalizes to any combination of top-level message types; adds metadata, schema records, compression, and random access

The original \brief also mentioned internal buffering by sensor models as a use case. This is an implementation concern of individual sensor models and does not belong in the interface specification.

Changes

• Updated \brief for SensorDataSeries (removed the internal buffering language)
• Added \attention deprecation notes to both SensorDataSeries and SensorDataSeriesList explaining the rationale and the superseding formats

Recommendation from maintainers

Per @jdsika, @pmai, and @thomassedlmayer in #900: deprecate now, remove entirely in v4.0.0.

Resolves #900

[pmai]

Minor wording changes, should also generally refer to the trace file formats, without discussing specific ones.

[jdsika]

Hark, good @pmai! Thy counsel, wise and true,
Hath been applied in full — each word made new.
The version reads 'OSI 4.0.0' as thou decreed,
No '.osi' nor '.mcap' remains — generic indeed.
And 'time steps' now stand parted, twain not one,
Thy changes requested are resolved, the deed is done.

Pray, review once more this humble scribe's revision,
And grant, if't please thee, thy approving vision.

[pmai]

To Merge, or Not to Merge

O, most valiant contributor,

I have with attentive eye scanned these lines of artful code. Truly, 'tis a work of great merit and industrious soul! The logic, once a tangled thicket of doubt, now shines with the brightness of a thousand midday suns.

Though I didst search for flaws with the hunger of a ghost seeking vengeance, I find none. No bugs do creep within these shadows, and the performance—stay!—it hath the swiftness of a winged messenger.

"The play’s the thing..."
And in this play, thy script is flawless.

Mine heart is light; the conscience is clear. I do set my seal upon this endeavor with a glad spirit.

I pray you, let the gates be opened! LGTM.