Added Biqquery support + added bigquery to examples + fixed issues + … #78

Job	Run time
checks	27s
unit-matrix (databricks_spark, spark, unit and databricks_spark, true)	32s
unit-matrix (snowflake, snowflake, unit and snowflake)	14s
unit-matrix (postgres, postgres, unit and postgres)	14s
unit-matrix (bigquery, bigquery_bf, unit and bigquery)	18s
examples-matrix (duckdb, basic_demo)	37s
examples-matrix (duckdb, api_demo)	38s
examples-matrix (duckdb, materializations_demo)	32s
examples-matrix (postgres, postgres, cache_demo)	39s
examples-matrix (duckdb, cache_demo)	38s
examples-matrix (duckdb, incremental_demo)	35s
examples-matrix (postgres, postgres, dq_demo)	36s
examples-matrix (postgres, postgres, api_demo)	40s
examples-matrix (postgres, postgres, basic_demo)	34s
examples-matrix (duckdb, macros_demo)	38s
examples-matrix (postgres, postgres, incremental_demo)	39s
examples-matrix (duckdb, dq_demo)	36s
examples-matrix (postgres, postgres, materializations_demo)	38s
examples-matrix (postgres, postgres, macros_demo)	38s
examples-matrix (databricks_spark, spark, basic_demo, true)	1m 3s
examples-matrix (databricks_spark, spark, materializations_demo, true)	2m 56s
examples-matrix (databricks_spark, spark, incremental_demo, true)	1m 6s
examples-matrix (databricks_spark, spark, macros_demo, true)	1m 8s
examples-matrix (databricks_spark, spark, api_demo, true)	1m 11s
examples-matrix (databricks_spark, spark, dq_demo, true)	1m 5s
examples-matrix (databricks_spark, spark, cache_demo, true)	1m 4s
	19m 56s

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