Add FirebaseFunctions.getHttpsCallableFromURL#3659

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inlined merged 5 commits intomasterfrom

inlined.httpsCallableFromURL

Apr 19, 2022

Commits on Apr 17, 2022

Initial commit; don't know how to run formatter or integration tests
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Commits on Apr 18, 2022

Commits on Apr 19, 2022

Finally fix style issues
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