Tuist project configuration

[watt]

This PR replaces the CocoaPods-based project generation with Tuist. In a follow-up PR I'll remove CocoaPods entirely.

Setting up takes a few steps, first to get Mise and then to get Tuist from that.

# install mise
brew install mise
# add mise activation line to your zshrc
echo 'eval "$(mise activate zsh)"' >> ~/.zshrc
# load mise into your shell
source ~/.zshrc
# install dependencies
mise install

# only necessary for first setup or after changing dependencies
tuist install --path Samples
# generates and opens the Xcode project
tuist generate --path Samples

Checklist

• Unit Tests
• UI Tests
• Snapshot Tests (iOS only)
• I have made corresponding changes to the documentation