Feat: Add full_table_id to Table init

[caleb-palmer]

python-bigquery/google/cloud/bigquery/table.py

Lines 1385 to 1388 in 6e88d7d

	@property
	def full_table_id(self):
	"""Union[str, None]: ID for the table (:data:`None` until set from the
	server).

Could the full_table_id property be added to a Table upon initialization? It seems like this wouldn't be an issue, given that an initialized Table sets the TableReference property and the full_table_id is equivalent to TableReference.str().