perf(cubesql): Avoid allocations in MetaContext methods (#9228) #3634

Job	Run time
Build native Linux 20 x86_64-unknown-linux-gnu Python fallback	4m 59s
latest-tag-sha	21s
build	7m 12s
tests (20.x, athena-export-bucket-s3)	18m 20s
tests (20.x, bigquery-export-bucket-gcs)	9m 32s
tests (20.x, clickhouse)	5m 30s
tests (20.x, clickhouse-export-bucket-s3)	5m 53s
tests (20.x, databricks-jdbc)	6m 16s
tests (20.x, databricks-jdbc-export-bucket-s3)	6m 23s
tests (20.x, databricks-jdbc-export-bucket-azure)	6m 52s
tests (20.x, mssql)	6m 36s
tests (20.x, mysql)	5m 20s
tests (20.x, postgres)	5m 16s
tests (20.x, redshift)	5m 45s
tests (20.x, redshift-export-bucket-s3)	5m 58s
tests (20.x, snowflake)	5m 39s
tests (20.x, snowflake-export-bucket-s3)	5m 55s
tests (20.x, snowflake-export-bucket-azure)	5m 35s
tests (20.x, snowflake-export-bucket-azure-via-storage-integration)	5m 42s
tests (20.x, snowflake-export-bucket-gcs)	5m 43s
	2h 8m 47s

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