RemoteConfig: Missing types for RemoteConfigParameterValue: RolloutValue and PersonalizationValue

[VFUC]

Describe your environment

• Operating System version: n.a.
• Firebase SDK version: 13.4.0
• Firebase Product: RemoteConfig
• Node.js version: latest
• NPM version: latest

Describe the problem

The RemoteConfig types in this SDK seem not to be up to date with the Firebase RemoteConfig API. When downloading a RemoteConfig template, the API can return parameter values of type RolloutValue and PersonalizationValue, as documented in the Firebase RemoteConfig API docs.

This SDK is missing these types. Specifically, I would expect them to show up here.

We are building tooling on top of the Firebase API, which rely on these types - the lack of their support currently breaks this. If possible, please make the SDK up to date with the API.

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