MAINT: extend caching and review `Surrogates` API

[fkuehlein]

Commit message

Extend caching according to 93ab748 to

• RecurrenceNetwork and child classes
• Surrogates

Review API of Surrogates to enable caching and reduce redundancy

• remove unhashable argument original_data in surrogate methods, use respective attribute
• make embedding a property as in RecurrencePlot
• substitute static method normalize_time_series_array() with regular method normalize_original_data() with same functionality
• __make recurrence_plot() a static method_ (missing in commit message)_
• add attributes self.N, self.n_time
• adapt tests, implement additional tests

Resolve and re-enable pylint flag no-member

Comment

The changed API of the Surrogates class should be reviewed. Also, what is Surrogates.recurrence_plot() intended for when we have the RecurrencePlot class?

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 70.03%. Comparing base (a53b987) to head (01b71c9). Report is 7 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #236 +/- ## ========================================== + Coverage 68.71% 70.03% +1.31% ========================================== Files 44 44 Lines 6138 6124 -14 ========================================== + Hits 4218 4289 +71 + Misses 1920 1835 -85 ```

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