feat: Implement nested queries and CTE.

[mediuminvader]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 3965355739

• 273 of 507 (53.85%) changed or added relevant lines in 18 files are covered.
• 441 unchanged lines in 16 files lost coverage.
• Overall coverage decreased (-1.3%) to 66.41%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
dozer-core/src/dag/executor.rs	2	3	66.67%
dozer-orchestrator/src/simple/orchestrator.rs	0	1	0.0%
dozer-sql/src/pipeline/expression/builder.rs	0	1	0.0%
dozer-sql/src/pipeline/product/join.rs	2	3	66.67%
dozer-core/src/dag/executor_utils.rs	3	5	60.0%
dozer-sql/src/pipeline/errors.rs	0	2	0.0%
dozer-core/src/dag/errors.rs	0	3	0.0%
dozer-sql/src/pipeline/tests/utils.rs	14	17	82.35%
dozer-orchestrator/src/pipeline/connector_source.rs	0	6	0.0%
dozer-sql/src/pipeline/product/tests/pipeline_test.rs	0	6	0.0%

Files with Coverage Reduction	New Missed Lines	%
dozer-api/src/grpc/shared_impl/mod.rs	1	84.52%
dozer-orchestrator/src/pipeline/connector_source.rs	1	23.2%
dozer-sql/src/pipeline/expression/scalar/tests/scalar_common.rs	4	90.2%
dozer-sql/src/pipeline/product/tests/pipeline_test.rs	4	0%
dozer-sql/src/pipeline/expression/builder.rs	8	61.0%
dozer-orchestrator/src/simple/orchestrator.rs	10	0%
dozer-sql/src/pipeline/builder.rs	14	78.07%
dozer-orchestrator/src/simple/executor.rs	15	0%
dozer-core/src/dag/executor.rs	20	84.51%
dozer-sql/src/pipeline/tests/builder_test.rs	23	81.42%

Totals
Change from base Build 3951538599:	-1.3%
Covered Lines:	22011
Relevant Lines:	33144

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💛 - Coveralls