EOExecutor improvements, part 3

[AleksMat]

Implements various improvements in EOExecutor class and especially in the generated report. Changes are documented in commit messages.

[zigaLuksic]

Carrying the handler generator around makes the code a bit less readable, but I see no better way

[codecov-commenter]

Codecov Report

Merging #360 (877d846) into develop-v1.0 (306b0da) will increase coverage by 0.10%.
The diff coverage is 92.37%.

@@               Coverage Diff                @@
##           develop-v1.0     #360      +/-   ##
================================================
+ Coverage         82.88%   82.99%   +0.10%     
================================================
  Files                53       53              
  Lines              5365     5422      +57     
================================================
+ Hits               4447     4500      +53     
- Misses              918      922       +4     

Impacted Files	Coverage Δ
core/eolearn/core/extra/ray.py	89.28% <75.00%> (ø)
.../eolearn/visualization/eoexecutor_visualization.py	88.13% <84.61%> (-0.04%)	⬇️
core/eolearn/core/eoexecution.py	93.15% <96.61%> (+0.17%)	⬆️
core/eolearn/core/eonode.py	94.23% <100.00%> (ø)
core/eolearn/core/fs_utils.py	96.42% <100.00%> (+1.07%)	⬆️

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