FR: `rules-unit-testing v2` expose `RulesTestContext.functions()`

Describe your environment

Operating System version: MacOS 12.1
Browser version: Firefox 97.0.1
Firebase SDK version: @firebase/rules-unit-testing 2.0.1
Firebase Product: rules-unit-testing, functions

Describe the problem

I would like to write automated e2e tests to validate my cloud functions using Firebase emulators.

With @firebase/rules-unit-testing v1, I could easily get a Functions context with fake authentication :

    const app = initializeTestApp({ 
        projectId: MY_PROJECT_ID, 
        auth: { uid: "my_uid"}
    })
    app.functions().useEmulator("localhost", 5001)
    const funcToTest = app.functions().httpsCallable("myFunctionToTest")
    // Do some tests

With @firebase/rules-unit-testing v2, there is no way to do the same :

const testEnv = await initializeTestEnvironment({
    projectId: MY_PROJECT_ID,
})

const authenticatedContext = testEnv.authenticatedContext("my_uid")

//There is no `authenticatedContext.functions()` accessor

This seems extremely problematic to me, since it makes cloud functions e2e testing a real pain.

I would be happy to talk about this with you :)

firebase / firebase-js-sdk

FR: `rules-unit-testing v2` expose `RulesTestContext.functions()` #6059

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Describe the problem