Buffered read for vectors journal

[javitonino]

Description

Just a free performance boost. Quick numbers is that this reduces datapoint loading time by 90% and total search time by ~5% (depends heavily on number of segments).

How was this PR tested?

Describe how you tested this PR.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (440ed1b) 82.17% compared to head (3ed0436) 82.17%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1811      +/-   ##
==========================================
- Coverage   82.17%   82.17%   -0.01%     
==========================================
  Files         338      338              
  Lines       19744    19744              
==========================================
- Hits        16225    16224       -1     
- Misses       3519     3520       +1     

Flag	Coverage Δ
ingest	70.06% <ø> (ø)
node-sidecar	95.39% <ø> (ø)
nucliadb	70.28% <ø> (-0.01%)	⬇️
reader	80.72% <ø> (ø)
sdk	40.58% <ø> (ø)
search	74.44% <ø> (ø)
standalone	87.79% <ø> (ø)
train	63.60% <ø> (ø)
utils	81.62% <ø> (ø)
writer	85.59% <ø> (ø)

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