Add MessengerMyContact function

See merge request elixxir/elixxir-dapps-sdk-swift!114

Use client to retrieve my facts, instead of database

Update Bindings

See merge request elixxir/elixxir-dapps-sdk-swift!113

elixxir/client@66798228
go version go1.17.13 darwin/arm64
Xcode 14.0.1 Build version 14A400
gomobile bind target: ios,iossimulator,macos

Improve error handling

XXMessengerClient.BackupStorage improvements

See merge request elixxir/elixxir-dapps-sdk-swift!111

Backup improvements & example

See merge request elixxir/elixxir-dapps-sdk-swift!110

This reverts commit 90d0e9a0.

This reverts commit 8578ae69.