feature: Read object store files in parallel

[karolisg]

Closes #934

[coveralls]

Pull Request Test Coverage Report for Build 4626194253

• 50 of 55 (90.91%) changed or added relevant lines in 3 files are covered.
• 242 unchanged lines in 6 files lost coverage.
• Overall coverage increased (+0.2%) to 72.223%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
dozer-ingestion/src/errors.rs	0	1	0.0%
dozer-ingestion/src/connectors/object_store/table_reader.rs	46	50	92.0%

Files with Coverage Reduction	New Missed Lines	%
dozer-ingestion/src/errors.rs	15	7.89%
dozer-ingestion/src/connectors/object_store/table_reader.rs	18	78.77%
dozer-sql/src/pipeline/expression/tests/comparison.rs	23	80.26%
dozer-api/src/generator/protoc/generator/implementation.rs	36	86.67%
dozer-core/src/dag_impl.rs	63	74.8%
dozer-types/src/helper.rs	87	75.7%

Totals
Change from base Build 4614393274:	0.2%
Covered Lines:	33565
Relevant Lines:	46474

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💛 - Coveralls