Split history context from retrieved contexts

[sunbit]

retrieved context will store both text and pointer to original paragraph

Description

Describe the proposed changes made in this PR.

How was this PR tested?

Describe how you tested this PR.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.63%. Comparing base (c10226c) to head (d0ea7cc).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2393      +/-   ##
==========================================
+ Coverage   86.60%   86.63%   +0.03%     
==========================================
  Files         373      373              
  Lines       22872    22872              
==========================================
+ Hits        19808    19815       +7     
+ Misses       3064     3057       -7     

Flag	Coverage Δ
nucliadb	73.58% <ø> (+0.10%)	⬆️
nucliadb-ingest	29.67% <ø> (ø)
nucliadb-reader	25.38% <ø> (ø)
nucliadb-search	37.53% <ø> (ø)
nucliadb-standalone	47.83% <ø> (ø)
nucliadb-train	46.75% <ø> (ø)
nucliadb-writer	40.69% <ø> (ø)
nucliadb_dataset	60.09% <ø> (ø)
nucliadb_models	85.11% <ø> (ø)
nucliadb_sdk	77.48% <ø> (ø)
nucliadb_sidecar	92.75% <ø> (-1.70%)	⬇️
nucliadb_telemetry	86.55% <ø> (ø)
nucliadb_utils	83.22% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.