Customize overwrite tables

[ellisvalentiner]

The _create_overwrite_table method uses a hardcoded format for the table name and duration for the table expiration.
It would be nice to be able to provide user-defined format for the table name and to set a table expiration date using a duration or explicit date time.

target-bigquery/target_bigquery/core.py

Lines 343 to 363 in 73a468a

	def _create_overwrite_table(self) -> None:
	self.table = BigQueryTable(
	name=f"{self.table_name}__{time.strftime('%Y%m%d%H%M%S')}__{uuid.uuid4()}",
	**self.table_opts,
	)
	self.table.create_table(
	self.client,
	self.apply_transforms,
	**{
	"table": {
	"expires": datetime.datetime.now() + datetime.timedelta(days=1),
	},
	"dataset": {
	"location": self.config.get(
	"location",
	BigQueryTable.default_dataset_options()["location"],
	)
	},
	},
	)
	time.sleep(2.5) # Wait for eventual consistency

Related to #99