Add summarize to sdk

[lferran]

Description

Describe the proposed changes made in this PR.

How was this PR tested?

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[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (d487a11) 79.40% compared to head (361a7c1) 82.12%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
nucliadb/nucliadb/search/search/summarize.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1731      +/-   ##
==========================================
+ Coverage   79.40%   82.12%   +2.72%     
==========================================
  Files         334      334              
  Lines       19550    19602      +52     
==========================================
+ Hits        15523    16099     +576     
+ Misses       4027     3503     -524     

Flag	Coverage Δ
ingest	69.05% <ø> (-0.09%)	⬇️
nucliadb	70.39% <80.00%> (+4.70%)	⬆️
sdk	40.58% <ø> (ø)
search	79.04% <40.00%> (-0.06%)	⬇️
writer	85.15% <ø> (+0.69%)	⬆️

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