Add support to retrieve from SAMLResponse the AuthnInstant and AuthnC… #373

Job	Run time
rubocop	9s
Unit test (ubuntu-20.04, 3)	19s
Unit test (ubuntu-20.04, 3.1)	19s
Unit test (ubuntu-20.04, 3.2)	19s
Unit test (ubuntu-20.04, 3.3)	18s
Unit test (ubuntu-20.04, jruby-9.4)	49s
Unit test (ubuntu-20.04, truffleruby)	1m 58s
Unit test (macos-latest, 3)	21s
Unit test (macos-latest, 3.1)	28s
Unit test (macos-latest, 3.2)	25s
Unit test (macos-latest, 3.3)	22s
Unit test (macos-latest, jruby-9.4)	36s
Unit test (macos-latest, truffleruby)	1m 42s
Unit test (windows-latest, 3)	2m 38s
Unit test (windows-latest, 3.1)	1m 54s
Unit test (windows-latest, 3.2)	1m 17s
Unit test (windows-latest, 3.3)	1m 28s
finish	2s
	15m 24s

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