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Add AbstractChunkKeyEncoding and chunk key encoding registration (#234)

* Add AbstractChunkKeyEncoding, rename ChunkEncoding

* Add constraint

Co-authored-by: Anshul Singhvi <anshulsinghvi@gmail.com>

* chore: Update to new master

* feat: Add SuffixChunkKeyEncoding

* Registration system for chunk key encoding (#242)

* Implement a registration system for chunk key encoding

* refactor: Add typed ChunkKeyEncodingEntry to chunk key encoding registration

Introduce `ChunkKeyEncodingEntry` struct pairing
`return_type::Type{<:AbstractChunkKeyEncoding}` with `parser::Function`,
replacing the bare `Dict{String, Function}` registry.

- `register_chunk_key_encoding(parser, name, ::Type{T}=AbstractChunkKeyEncoding)`
  now stores a `ChunkKeyEncodingEntry` with the declared return type; the type
  is the last (optional) argument to work naturally with do-block syntax
- `parse_chunk_key_encoding` asserts the result against `entry.return_type`
  at runtime
- All built-in registrations updated with their specific concrete types
  (`ChunkKeyEncoding` for "default" and "v2", `SuffixChunkKeyEncoding` for
  "suffix")

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Anshul Singhvi <anshulsinghvi@gmail.com>
Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

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