Add class parameters, flags, and privateWithin to newClass in reflect API #33815

Job	Run time
test	55m 48s
test_non_bootstrapped	0s
test_scala2_library_tasty	0s
test_windows_fast	41m 1s
MiMa	12m 1s
test_windows_full	0s
community_build_a	51m 19s
community_build_b	1h 29m 22s
build-msi-package	0s
community_build_c	1h 7m 38s
test_java8	0s
test_sbt	21m 6s
build-sdk-package / build	7m 48s
test-msi-package	0s
build-chocolatey-package / build	18s
test-chocolatey-package	0s
publish_nightly	0s
publish_release	0s
nightly_documentation	0s
open_issue_on_failure	0s
	5h 46m 21s

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