Snapshot codec builders

[CraigMacomber]

Description

Add a util for snapshotting the format for all versions of a codec, and use it for a few codecs.

Reviewer Guidance

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[Copilot]

Pull request overview

Adds a utility to snapshot all supported codec format schemas across versions, and updates several tests/snapshots to use it.

Changes:

• Introduced snapshotCodecFormats helper for capturing { version, minVersionForCollab, schema } per codec version.
• Updated/added tests and snapshot outputs to use versioned codec-format snapshots (e.g., Schema, DetachedFieldIndex).
• Refactored versioned codec builder typing/exports to expose schema for snapshotting.

Reviewed changes

Copilot reviewed 14 out of 14 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
packages/dds/tree/src/test/snapshots/snapshotTools.ts	Adds snapshotCodecFormats helper to snapshot all codec format versions.
packages/dds/tree/src/test/snapshots/schema.spec.ts	Adjusts schema snapshot encoding options (removes minVersionForCollab).
packages/dds/tree/src/test/snapshots/output/files/EncodedFieldBatch.json	Updates existing snapshot content to versioned format list.
packages/dds/tree/src/test/snapshots/output/codecFormats/formats_Schema_codec.json	Adds snapshot output for Schema codec formats across versions.
packages/dds/tree/src/test/snapshots/output/codecFormats/formats_DetachedFieldIndex_codec.json	Adds snapshot output for DetachedFieldIndex codec formats across versions.
packages/dds/tree/src/test/snapshots/index.ts	Re-exports snapshotCodecFormats.
packages/dds/tree/src/test/feature-libraries/schema-index/schemaSummarizer.spec.ts	Adds a codec format snapshot test for Schema codec builder.
packages/dds/tree/src/test/feature-libraries/chunked-forest/codec/format.spec.ts	Removes old single-schema snapshot test file.
packages/dds/tree/src/test/feature-libraries/chunked-forest/codec/codecs.spec.ts	Adds codec format snapshot test for fieldBatchCodecBuilder.
packages/dds/tree/src/test/core/tree/detachedFieldIndexCodec.spec.ts	Adds codec format snapshot test for DetachedFieldIndex codec builder.
packages/dds/tree/src/core/tree/detachedFieldIndexCodecs.ts	Updates build options typing to ICodecOptions and makes fields readonly.
packages/dds/tree/src/codec/versioned/index.ts	Removes makeVersionedValidatedCodec export.
packages/dds/tree/src/codec/versioned/codec.ts	Refactors versioned codec typing to propagate schema; changes builder generics.
packages/dds/tree/src/codec/index.ts	Removes makeVersionedValidatedCodec export from the main codec barrel.

[CraigMacomber]

These are reordered so cases which only want to specify TBuildOptions (which is the main thing impacting the exposed API) can do so without having to specify default values for the others.