Draft: Add macOS support

This MR contains Bindings.xcframework build manually from client repo, using the following script:

go mod tidy
rm -rf vendor/
go build ./...
go get golang.org/x/mobile/bind
go install golang.org/x/mobile/cmd/gomobile@latest
gomobile init
gomobile bind -target ios,iossimulator,macos gitlab.com/elixxir/client/bindings

go version go1.17.13 darwin/arm64

.gitlab-ci.yml

@@ -6,9 +6,9 @@ tests:
   tags: 
     - ios
   script:
-    - echo -e "\e[0Ksection_start:`date +%s`:test_macos\r\e[0KRun tests on macOS"
+    - echo -e "\\e[0Ksection_start:`date +%s`:test_macos\\r\\e[0KRun tests on macOS"
     - ./run-tests.sh macos
-    - echo -e "\e[0Ksection_end:`date +%s`:test_macos\r\e[0K"
-    - echo -e "\e[0Ksection_start:`date +%s`:test_macos\r\e[0KRun tests on iOS Simulator"
+    - echo -e "\\e[0Ksection_end:`date +%s`:test_macos\\r\\e[0K"
+    - echo -e "\\e[0Ksection_start:`date +%s`:test_macos\\r\\e[0KRun tests on iOS Simulator"
     - ./run-tests.sh ios
-    - echo -e "\e[0Ksection_end:`date +%s`:test_macos\r\e[0K"
+    - echo -e "\\e[0Ksection_end:`date +%s`:test_macos\\r\\e[0K"