add Zigzag encoding for RNTuple and catch up changes

[Moelf]

• add Zig zag encoding
• catch up all the changes so far, update all the .root files with nightly root
• schema extension reverse engineered, this should be documented in their official spec

ROOT Version: 6.29/01
Built for linuxx8664gcc on Jun 23 2023, 00:07:36
From heads/master@a90d76b7

fix #262

[codecov[bot]]

Codecov Report

Patch coverage: 94.91% and project coverage change: +0.15 :tada:

Comparison is base (4c155bb) 87.52% compared to head (d500810) 87.67%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #264 +/- ## ========================================== + Coverage 87.52% 87.67% +0.15% ========================================== Files 18 18 Lines 2300 2345 +45 ========================================== + Hits 2013 2056 +43 - Misses 287 289 +2 ``` | [Impacted Files](https://app.codecov.io/gh/JuliaHEP/UnROOT.jl/pull/264?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaHEP) | Coverage Δ | | |---|---|---| | [src/RNTuple/fieldcolumn\_schema.jl](https://app.codecov.io/gh/JuliaHEP/UnROOT.jl/pull/264?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaHEP#diff-c3JjL1JOVHVwbGUvZmllbGRjb2x1bW5fc2NoZW1hLmps) | `96.20% <85.71%> (+0.09%)` | :arrow_up: | | [src/RNTuple/fieldcolumn\_reading.jl](https://app.codecov.io/gh/JuliaHEP/UnROOT.jl/pull/264?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaHEP#diff-c3JjL1JOVHVwbGUvZmllbGRjb2x1bW5fcmVhZGluZy5qbA==) | `93.75% <90.47%> (-1.05%)` | :arrow_down: | | [src/RNTuple/footer.jl](https://app.codecov.io/gh/JuliaHEP/UnROOT.jl/pull/264?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaHEP#diff-c3JjL1JOVHVwbGUvZm9vdGVyLmps) | `96.96% <100.00%> (+1.84%)` | :arrow_up: | ... and [2 files with indirect coverage changes](https://app.codecov.io/gh/JuliaHEP/UnROOT.jl/pull/264/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaHEP)

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