CLN & REORG core/common.py

[jreback]

some ideas on reorging.

• rename pandas/util/misc.py to pandas/util/tools.py or pandas/util/util.py (a69d628)
  • move core/generic.py/_validate_kwargs (and new validate_args) here (6e64787)
  • move the various python utilities section from core/common (CLN: reorg type inference & introspection #13147)
• create pandas/types/ (CLN: cleaning core/common.py #12804)
  • move pandas/core/dtypes.py here
• create pandas/types/types.py (CLN: cleaning core/common.py #12804)
  • move bind_method, create_pandas_abc_types here (from core/common.py)
  • move the is_...._dtype to here (CLN: reorg type inference & introspection #13147)
• move core/common.py/concat* to new sub-package types/concat (BUG: SparseSeries concat results in dense #12844)
• move core/common.py/take* stuff to algorithms (may need to create a sub-package for this) (CLN: cleaning core/common.py #12804)
• create new sub-package pandas/formats (CLN: cleaning core/common.py #12804)
  • move core/common.py/printing utilities to new sub-package pandas/formats/printing.py (CLN: cleaning core/common.py #12804)
  • move core/format.py here as well (maybe split later) (CLN: cleaning core/common.py #12804)

[jreback]

cc @wesm

[gfyoung]

+1 for the reorganization. Will move the arg and kwarg validators into their own separate module in my own PR (#12413).