[maxHeight] Expose maxWidth/maxHeight layer constraints in LayerInfo

[bcostdolby]

Summary

The server already honours layer.maxWidth / layer.maxHeight on the select and project signaling commands (it maps them to setMaximumDimensions()), and View.select() / View.project() / View.connect({ layer }) forward the layer object verbatim — so this works at runtime today, but the public LayerInfo type only declared the encoding/spatial/temporal ids, so TS consumers were rejected and no one could discover the feature. This PR is documentation + typings only; no runtime change, and nothing in the SDK strips or validates unknown layer fields (verified in View.js and Signaling.js, which pass layer/mapping straight through to signaling.cmd).

The semantic point worth capturing for consumers (and the reason this matters for multiview): the two kinds of layer fields behave very differently.

// Small tile: cap the resolution, ABR still picks the best layer that fits.
view.project(sourceId, [{ media: 'video', trackId: 'video', layer: { maxHeight: 180 } }])

// Fixed layer: pins the track to encoding 'h', ABR is bypassed.
view.project(sourceId, [{ media: 'video', trackId: 'video', layer: { encodingId: 'h' } }])

// Reset the restriction.
view.select({ maxWidth: 0, maxHeight: 0 })

Naming matches the native SDKs (LayerDataSelection.withConstraints() on Android, initWithMaxSpatialLayerId:maxTemporalLayerId:maxWidth:maxHeight: on iOS) so the platforms stay consistent.

Generated dist/millicast.d.ts picks the fields up from src/types/index.d.ts via the normal build; lint, tsc --noEmit, unit tests (29 suites / 173 tests) and npm run build pass in packages/millicast-sdk.

Jira: https://opentelly.atlassian.net/browse/OPTI-4136 (epic: https://opentelly.atlassian.net/browse/OPTI-4113)

Link to Devin session: https://dolby.devinenterprise.com/sessions/6e4f2fcc6cea412da1d3c06714c2a817
Requested by: @bcostdolby

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🦋 Changeset detected

Latest commit: f64b0de

The changes in this PR will be included in the next version bump.

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@millicast/sdk	Minor

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✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.