Add an option to detect overloads with optional parameters #1363

Job	Run time
compute_package_version	3s
check_documentation	31s
build_and_test (ubuntu-latest, Release, roslyn3.8)	2m 17s
build_and_test (ubuntu-latest, Release, roslyn4.2)	2m 15s
build_and_test (ubuntu-latest, Release, roslyn4.4)	2m 12s
build_and_test (ubuntu-latest, Release, roslyn4.6)	2m 20s
build_and_test (ubuntu-latest, Release, roslyn4.8)	2m 1s
build_and_test (ubuntu-latest, Release, default)	2m 15s
build_and_test (windows-latest, Release, roslyn3.8)	3m 59s
build_and_test (windows-latest, Release, roslyn4.2)	4m 11s
build_and_test (windows-latest, Release, roslyn4.4)	5m 27s
build_and_test (windows-latest, Release, roslyn4.6)	5m 6s
build_and_test (windows-latest, Release, roslyn4.8)	4m 2s
build_and_test (windows-latest, Release, default)	3m 55s
create_nuget	2m 10s
validate_nuget	56s
deploy	18s
create_release	0s
	43m 58s

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