Spooq

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* [MOD] Add functionality to log cleansed values into separate struct column (column_to_log_cleansed_values)
* [MOD] Add ignore_ambiguous_columns to Mapper
* [MOD] Log spooq version when importing
* [REM] Drop separate spark package (bin-folder) as pip package can now handle all tests as well
* [ADD] Github action to test on label (test-it) or merge into master

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* [ADD] EnumCleaner Transformer
* [MOD] Add support for dynamic default values with the ThresholdCleaner

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* [MOD] extended_string_to_timestamp: now keeps milli seconds (no more cast to LongType) for conversion to Timestamp

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* [ADD] Spark 3 support (different handling in tests via `only_sparkX` decorators)
* [FIX] Fix null types in schema for custom transformations on missing columns
* [MOD] (BREAKING CHANGE!) set default for `ignore_missing_columns` of Mapper to False (fails on missing input columns)

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* [MOD] extended_string_to_timestamp: it can now handle unix timestamps in seconds and in milliseconds
* [MOD] extended_string_to_date: it can now handle unix timestamps in seconds and in milliseconds

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* [MOD] Add support for prepending and appending mappings on input dataframe (Mapper)
* [MOD] Add support for custom spark sql functions in mapper without injecting methods
* [MOD] Add support for "on"/"off" and "enabled"/"disabled" in extended_string_to_boolean custom mapper transformations
* [ADD] New custom mapper transformations:

- extended_string_to_date
- extended_string_unix_timestamp_ms_to_date
- has_value