Added a workflow to parallelise the E2E tests #8

Job	Run time
discover-tests	4s
e2e-tests (tests/e2e/test_complex_types.py, thrift)	1m 20s
e2e-tests (tests/e2e/test_variant_types.py, thrift)	37s
e2e-tests (tests/e2e/test_concurrent_telemetry.py, sea)	36s
e2e-tests (tests/e2e/test_concurrent_telemetry.py, thrift)	33s
e2e-tests (tests/e2e/test_complex_types.py, sea)	29s
e2e-tests (tests/e2e/test_variant_types.py, sea)	34s
merge-coverage	1m 1s
	5m 14s

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