feat!: account linking (#729) #994

Job	Run time
setup	5s
test (./examples/with-i18next)	4m 43s
test (./examples/with-phone-password)	3m 21s
test (./examples/with-sign-in-up-split-emailpassword)	3m 53s
test (./examples/with-multiple-email-sign-in)	6h 0m 14s
test (./examples/with-emailpassword-vercel)	4m 51s
test (./examples/with-emailverification-then-password-thirdpartyemailpassword)	4m 35s
test (./examples/with-one-login-per-subdomain)	5m 12s
test (./examples/with-emailverification-with-otp)	3m 27s
test (./examples/with-update-email-post-verification)	4m 27s
test (./examples/with-thirdpartyemailpassword-passwordless)	5m 40s
test (./examples/with-svelte-react-thirdpartyemailpassword)	2m 35s
test (./examples/with-localstorage)	3m 47s
test (./examples/with-netlify)	5m 17s
test (./examples/with-no-session-on-sign-up-thirdpartyemailpassword)	3m 2s
test (./examples/with-thirdpartyemailpassword-2fa-passwordless)	4m 46s
test (./examples/with-cli-login)	4m 12s
	7h 4m 7s

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