Help implement Metals' infer expected type feature #32165

Job	Run time
test_non_bootstrapped	0s
test	51m 10s
test_scala2_library_tasty	0s
test_windows_fast	49m 51s
MiMa	12m 12s
test_windows_full	0s
community_build_a	54m 41s
community_build_c	1h 1m 1s
test_sbt	17m 7s
community_build_b	1h 27m 17s
build-msi-package	0s
test_java8	0s
build-sdk-package / build	7m 46s
build-chocolatey-package / build	16s
test-chocolatey-package	0s
publish_nightly	0s
publish_release	0s
nightly_documentation	0s
open_issue_on_failure	0s
	5h 41m 21s

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