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ARROW-2760: [Python] Remove legacy property definition syntax from parquet module and test them

Author: Krisztián Szűcs <szucs.krisztian@gmail.com>

Closes #2187 from kszucs/cython_properties and squashes the following commits:

d6a7f779 <Krisztián Szűcs> remove accidentally committed test helper script
77c59d66 <Krisztián Szűcs> return NotImplemented from equality check
b1e7bede <Krisztián Szűcs> raise NotImplementedError for index_page_offset
71f5edee <Krisztián Szűcs> flake8
74d53bb9 <Krisztián Szűcs> missing distinct_count equals to zero
40ba9651 <Krisztián Szűcs> expose missing parquet classes to pq namespace
6942eba1 <Krisztián Szűcs> comments in compare schemas
1e1c7cd6 <Krisztián Szűcs> test and fix column chunk metadata properties
ffa10413 <Krisztián Szűcs> expected distinct_count value is None
d55b96a8 <Krisztián Szűcs> fix types
dd362295 <Krisztián Szűcs> rename type property to physical_type
a43153e9 <Krisztián Szűcs> warn instead of print
266a022b <Krisztián Szűcs> implement equality operator on ParquetSchema and ColumnSchema
c58441a4 <Krisztián Szűcs> due to receiving extension class as argument it's possuble to use directly __cinit__ constructors instead of custom init methods
06e4f8ed <Krisztián Szűcs> remove enum cpdef
c0e2a08c <Krisztián Szűcs> replace old property syntax; move indent to formatting; test missing column stat properties