make small benchmark comparison between pg_sheet_fdw and ogr_fdw

[x] Image with ogr, postgis and sheet_fdw for benchmarking
[x] Create automatic foreign table script for ogr and sheet_fdw
[x] Create tpch queries for ogr and sheet_fdw tables
[x] Create script, that executes all queries and compares them to internal, local baseline queries
[x] turn output into nice table :)
[x] add baseline queries

polydbms / pg_sheet_fdw