feat(DRAFT): Improve flights.* dataset reproducibility

#642 (review), #642 (comment)

_data/flights.toml

@@ -0,0 +1,57 @@
+[[specs]]
+# This spec won't be part of the final PR.
+# Using it to demonstrate the deviation from [ISO_8601](https://en.wikipedia.org/wiki/ISO_8601)
+range     = [2001-01-01, 2001-03-31]
+n_rows    = 1_000
+suffix    = ".csv"
+dt_format = "ISO"
+
+[[specs]]
+start     = 2001-01-01
+end       = 2001-03-31
+n_rows    = 2_000
+suffix    = ".json"
+dt_format = "iso"
+
+[[specs]]
+start     = 2001-01-01
+end       = 2001-03-31
+n_rows    = 5_000
+suffix    = ".json"
+dt_format = "iso"
+
+[[specs]]
+start     = 2001-01-01
+end       = 2001-03-31
+n_rows    = 10_000
+suffix    = ".json"
+dt_format = "iso"
+
+[[specs]]
+start     = 2001-01-01
+end       = 2001-03-31
+n_rows    = 20_000
+suffix    = ".json"
+dt_format = "iso"
+
+[[specs]]
+start     = 2001-01-01
+end       = 2001-03-31
+n_rows    = 200_000
+suffix    = ".json"
+dt_format = "decimal"
+columns   = ["delay", "distance", "time"]
+
+[[specs]]
+start     = 2001-01-01
+end       = 2001-03-31
+n_rows    = 200_000
+suffix    = ".arrow"
+dt_format = "decimal"
+columns   = ["delay", "distance", "time"]
+
+[[specs]]
+start  = 2001-01-01
+end    = 2001-06-30
+n_rows = 3_000_000
+suffix = ".parquet"