Refactor summary collector

[frode-aarstad]

Issue
Resolves #2735

Approach
Improves the performance by moving more of the code filling out the summary dataframe from python back to c++.

Pre review checklist

• Added appropriate labels

Adding labels helps the maintainers when writing release notes, see sections and the
corresponding labels here: https://github.com/equinor/ert/blob/main/.github/release.yml

[codecov-commenter]

Codecov Report

Merging #2802 (66aa583) into main (e52240b) will decrease coverage by 0.06%.
The diff coverage is 9.61%.

@@            Coverage Diff             @@
##             main    #2802      +/-   ##
==========================================
- Coverage   65.20%   65.14%   -0.07%     
==========================================
  Files         653      654       +1     
  Lines       53480    53515      +35     
  Branches     4791     4804      +13     
==========================================
- Hits        34874    34862      -12     
- Misses      17007    17050      +43     
- Partials     1599     1603       +4     

Impacted Files	Coverage Δ
libres/lib/python/enkf_fs_summary_data.cpp	2.08% <2.08%> (ø)
res/enkf/export/summary_collector.py	100.00% <100.00%> (ø)
res/enkf/plot_data/ensemble_plot_data.py	54.05% <0.00%> (-27.03%)	⬇️
res/enkf/plot_data/ensemble_plot_data_vector.py	71.42% <0.00%> (-14.29%)	⬇️
libres/lib/enkf/block_fs_driver.cpp	81.35% <0.00%> (-0.57%)	⬇️
libres/lib/res_util/block_fs.cpp	53.67% <0.00%> (-0.45%)	⬇️
ert_gui/simulation/run_dialog.py	76.40% <0.00%> (+0.70%)	⬆️
ert_gui/ertwidgets/__init__.py	77.27% <0.00%> (+2.27%)	⬆️
ert_gui/ertwidgets/validationsupport.py	98.63% <0.00%> (+19.17%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update e52240b...66aa583. Read the comment docs.

[TerryHannant]

Look good