Feat/expression types #162
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This PR is on top of #157 so it may be good to merge #157 first. A diff between PR can be found here: https://github.com/tools4origins/pysparkling/pull/7/files
It adds column data types handling, mostly by implementing an
Expression.data_typemethods that take the DataFrame schema and returns the Expression typeI found a few minor issues (e.g. bad return type in functions) while implementing it so this PR fixes them too