Remove file transfer and backup on destroy

See merge request elixxir/elixxir-dapps-sdk-swift!127

Migrate example app to ComposableArchitecture's ReducerProtocol

See merge request elixxir/elixxir-dapps-sdk-swift!126

File transfers example

See merge request elixxir/elixxir-dapps-sdk-swift!124

Update Bindings

See merge request elixxir/elixxir-dapps-sdk-swift!125

elixxir/client@305d4fa4
go version go1.17.13 darwin/arm64
Xcode 14.0.1 Build version 14A400
gomobile bind target: ios,iossimulator,macos