Shared column schema: espn mbb game broadcasts schema

Columns shared verbatim across: espn_mbb_game_broadcasts, espn_nba_game_broadcasts.

Details

col_name	types	description
event_id	character	Unique event / game identifier (ESPN).
broadcast_id	character
type_id	character	Type identifier (numeric).
type_short_name	character
type_long_name	character
market_id	character
market_type	character
names	character
lang	character
region	character	Region label.