WIP: Convert to workspace (multi crate)

.github/attention.md

@@ -0,0 +1,5 @@
+Hey 👋 You DID in fact read my fancy PR description BEFORE you started reviewing the code, right? Else switch back to description now and read it in full:
+
+https://github.com/radixdlt/sargon/pull/131
+
+Thank you! Happy review! 🙏

.github/workflows/test.yml

@@ -122,7 +122,7 @@ jobs:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         run: |
           rustup target add aarch64-apple-darwin
-          sh ./scripts/ios/test.sh --codecov ${{ env.SWIFT_CODE_COV_REPORT_PATH }}
+          sh ./scripts/ios/test.sh --build --codecov ${{ env.SWIFT_CODE_COV_REPORT_PATH }}
 
       - name: Upload to CodeCov.io
         uses: RDXWorks-actions/codecov-action@main
@@ -204,7 +204,7 @@ jobs:
         uses: RDXWorks-actions/cargo-install@main
         with:
           crate: cargo-tarpaulin
-          tag: 0.27.3
+          tag: 0.30.0
           locked: true
 
       - name: Code Coverage - Generate