DRAFT: Version4 chunking

[JonasIsensee]

This is the most wip of the ai gen PRs.

It adds support for using the version 4 chunk index types.
Fixed Array Index, Implicit Index, Extensible Array Index, and V2 BTree index.

All of these now work for both reading and writing.
Additional work needs to be done for repeated addition of chunks after writing.

[JonasIsensee]

changed base to master to enable CI tests

[codecov]

Codecov Report

❌ Patch coverage is 76.85775% with 327 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.94%. Comparing base (f8fefb6) to head (6da15b2).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/btrees/v1btree_debug.jl	0.00%	163 Missing ⚠️
src/chunking/read_index_types.jl	65.75%	75 Missing ⚠️
src/chunking/write_api.jl	81.81%	16 Missing ⚠️
src/groups.jl	87.50%	13 Missing ⚠️
src/Filters.jl	42.85%	12 Missing ⚠️
src/btrees/v1btree_write.jl	84.21%	12 Missing ⚠️
src/chunking/argument_validation.jl	79.48%	8 Missing ⚠️
src/chunking/write_index_types.jl	95.51%	7 Missing ⚠️
src/object_headers.jl	0.00%	4 Missing ⚠️
src/chunking/chunked_array.jl	96.10%	3 Missing ⚠️
... and 8 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #689      +/-   ##
==========================================
- Coverage   87.40%   84.94%   -2.46%     
==========================================
  Files          37       54      +17     
  Lines        4588     5681    +1093     
==========================================
+ Hits         4010     4826     +816     
- Misses        578      855     +277     

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