[large-tiles] Integrate cross block series reader

[linasm]

What this PR does / why we need it:
Integrates CrossBlockReader into AggregateTiles process to allow aggregating series from multiple source blocks.

Special notes for your reviewer:

Does this PR introduce a user-facing and/or backwards incompatible change?:
NONE

Does this PR require updating code package or user-facing documentation?:
NONE

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (large-tiles-aggregation@0dbbff1). Click here to learn what that means.
The diff coverage is n/a.

@@                    Coverage Diff                    @@
##             large-tiles-aggregation   #2543   +/-   ##
=========================================================
  Coverage                           ?   71.7%           
=========================================================
  Files                              ?    1083           
  Lines                              ?   95799           
  Branches                           ?       0           
=========================================================
  Hits                               ?   68696           
  Misses                             ?   22486           
  Partials                           ?    4617           

Flag	Coverage Δ
#aggregator	76.0% <0.0%> (?)
#cluster	84.8% <0.0%> (?)
#collector	82.8% <0.0%> (?)
#dbnode	79.2% <0.0%> (?)
#m3em	74.4% <0.0%> (?)
#m3ninx	73.2% <0.0%> (?)
#m3nsch	51.1% <0.0%> (?)
#metrics	17.2% <0.0%> (?)
#msg	75.1% <0.0%> (?)
#query	67.6% <0.0%> (?)
#x	80.9% <0.0%> (?)

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

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[codecov]

Codecov Report

Merging #2543 into large-tiles-aggregation will not change coverage.
The diff coverage is n/a.

@@                   Coverage Diff                   @@
##           large-tiles-aggregation   #2543   +/-   ##
=======================================================
  Coverage                     48.8%   48.8%           
=======================================================
  Files                          948     948           
  Lines                        84952   84952           
=======================================================
  Hits                         41458   41458           
  Misses                       40076   40076           
  Partials                      3418    3418           

Flag	Coverage Δ
#aggregator	76.0% <0.0%> (ø)
#cluster	62.9% <0.0%> (ø)
#collector	71.4% <0.0%> (ø)
#dbnode	58.7% <0.0%> (ø)
#m3em	51.3% <0.0%> (ø)
#m3ninx	46.7% <0.0%> (ø)
#m3nsch	100.0% <0.0%> (ø)
#query	14.7% <0.0%> (ø)
#x	42.3% <0.0%> (ø)

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

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[gediminasgu]

This will panic.

[linasm]

Tagging @arnikola (not sure if you were subscribed to this PR notifications; also, not sure what is the original branch for this piece of code). I believe @gediminasgu has fixed it in his downstream branch, but still IMHO we should do a fix at the source so that we don't run into this again.

[gediminasgu]

This will panic too.

[linasm]

@arnikola (same as above).

[linasm]

Closing as outdated.