Remove the requirement for empty client in static functions

[cameronvoell]

Is your feature request related to a problem?

For some static functions that don't need the client of a specific user, (like getting inboxStatesForInboxIds or canMessage) downstream SDKs still need to create "empty" clients in order to call. Can we remove this requirement?

See https://github.com/xmtp/xmtp-android/blob/9ec205583ff3cdcf587a2ed88fd849fb3cb89b27/library/src/main/java/org/xmtp/android/library/Client.kt#L94-L113

Describe the solution to the problem

No response

Describe the uses cases for the feature

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Additional details

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