Fix duplicated garbage

[manycoding]

The pr does several things:

1. uses apply(str) to search for patterns in nested data
2. updates regex for better matching (it finds more symbols, especially entities)

apply(str) makes strings from nested objects (lists, dicts and any combination), and the downside is that the current regex won't search traling\ending whitespaces in nested data:
"['days inn lombard street hotel san francisco', 'lombard street days inn', 'days inn san francisco ', 'san francisco days inn hotel lombard st', 'san francisco day inn lombard street']"
Here r"(?P<spaces>^\s|\s$)" doesn't detect this whitespace in francisco '

Personally, I don't think it's crucial to find those whitespaces in nested data, any comments?

Performance (now, before):

1. Garbage performance
   nested data
   2k sample - 331ms vs 800ms
   12k sample - 1.4s vs 1.6s (2.4s including flattening)
   90k sample - 2:07m vs 1:31m (matt takes about 1:30m too)
   not nested
   10k sample - 560ms vs 600ms
2. Boost from removing flat_df varies, about 1s on 10k sample but it grows with the number of items. The biggest benefit is that pattern search is much faster on fewer nested columns with apply.str() than on larger number of flat columns.

And here's how it looks:

@ivankivanov you will be interested in this one.

[codecov]

Codecov Report

Merging #130 into neat_report will decrease coverage by 0.05%.
The diff coverage is 100%.

@@               Coverage Diff               @@
##           neat_report     #130      +/-   ##
===============================================
- Coverage        79.83%   79.78%   -0.06%     
===============================================
  Files               22       22              
  Lines             1582     1583       +1     
  Branches           273      273              
===============================================
  Hits              1263     1263              
  Misses             275      275              
- Partials            44       45       +1

Impacted Files	Coverage Δ
src/arche/data_quality_report.py	77.52% <ø> (ø)	⬆️
src/arche/arche.py	85.5% <100%> (ø)	⬆️
src/arche/report.py	97.75% <100%> (+0.05%)	⬆️
src/arche/rules/others.py	100% <100%> (ø)	⬆️
src/arche/readers/items.py	88.28% <0%> (-0.79%)	⬇️

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[codecov]

Codecov Report

Merging #130 into 0.3.6dev will decrease coverage by 0.03%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##           0.3.6dev     #130      +/-   ##
============================================
- Coverage     79.81%   79.77%   -0.04%     
============================================
  Files            22       22              
  Lines          1580     1582       +2     
  Branches        274      274              
============================================
+ Hits           1261     1262       +1     
  Misses          275      275              
- Partials         44       45       +1

Impacted Files	Coverage Δ
src/arche/data_quality_report.py	77.52% <ø> (ø)	⬆️
src/arche/arche.py	85.61% <100%> (ø)	⬆️
src/arche/report.py	97.75% <100%> (+0.05%)	⬆️
src/arche/rules/others.py	100% <100%> (ø)	⬆️
src/arche/readers/items.py	88.28% <0%> (-0.79%)	⬇️

---

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[andersonberg]

I agree it's not crucial, but maybe, if possible, we can make it optional. This is because I think it depends on the customer if they need to export, let's say, to a csv file and we have to remove trailing whitespaces

[manycoding]

@andersonberg But nested fields are not exportable to csv, aren't they?

[andersonberg]

Yes, you're right. So, yeah, we don't have to find whitespaces in nested data

[manycoding]

@Gallaecio Thanks for noting inconsistencies.
I updated regex to account for 	 and exclude&a;, and made every quantifier non-greedy.