[FEAT] Enable to_json_string for physical plan #9362

Job	Run time
integration-test-build (3.8)	7m 28s
benchmark-codspeed	12m 27s
rust-tests-platform (ubuntu)	3m 2s
rust-tests-platform (Windows)	7m 53s
unit-tests-with-coverage (3.8, py, 7.0.0, 0, ubuntu-20.04)	6m 16s
unit-tests-with-coverage (3.8, py, 7.0.0, 1, ubuntu-20.04)	5m 11s
check-unused-cargo-deps	1m 15s
unit-tests-with-coverage (3.10, py, 16.0.0, 0, ubuntu-20.04)	10m 41s
unit-tests-with-coverage (3.10, py, 16.0.0, 0, windows-latest)	7m 0s
doctests	2m 9s
unit-tests-with-coverage (3.10, py, 16.0.0, 1, ubuntu-20.04)	9m 56s
unit-tests-with-coverage (3.10, py, 16.0.0, 1, windows-latest)	6m 22s
unit-tests-with-coverage (3.10, ray, 16.0.0, 0, ubuntu-20.04)	15m 31s
style	2m 22s
unit-tests-with-coverage (3.10, ray, 16.0.0, 0, windows-latest)	6m 33s
test-imports-platform (ubuntu, 3.8)	2m 16s
test-imports-platform (Windows, 3.8)	4m 21s
test-imports	1s
integration-test-io (3.8, py)	7m 7s
integration-test-io (3.8, ray)	8m 36s
integration-test-sql (3.8, py)	2m 47s
integration-test-iceberg (3.8, py)	3m 40s
integration-test-io-credentialed	0s
integration-test-sql (3.8, ray)	3m 5s
integration-test-iceberg (3.8, ray)	3m 47s
integration-test-tpch (3.8, py)	1m 31s
integration-test-tpch (3.8, ray)	1m 28s
rust-tests	1s
unit-tests	1s
Publish coverage reports to CodeCov	10s
integration-tests	1s
	2h 22m 58s

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