Add justfile with common project commands

justfile

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+[group("Repo")]
+[doc("Default command; list all available commands.")]
+@list:
+  just --list --unsorted
+
+[group("Repo")]
+[doc("Open repo on GitHub in your default browser.")]
+repo:
+  open https://github.com/bitcoindevkit/bdk-dart
+
+[group("Submodule")]
+[doc("Initialize bdk-ffi submodule to committed hash.")]
+submodule-init:
+  git submodule update --init
+
+[group("Submodule")]
+[doc("Hard reset the bdk-ffi submodule to committed hash.")]
+submodule-reset:
+  git submodule update --force
+
+[group("Submodule")]
+[doc("Checkout the bdk-ffi submodule to the latest commit on master.")]
+submodule-to-master:
+  cd ./bdk-ffi/ \
+  && git fetch origin \
+  && git checkout master \
+  && git pull origin master
+
+[group("Dart")]
+[doc("Format the Dart codebase.")]
+format:
+  dart format .
+
+[group("Dart")]
+[doc("Run static analysis.")]
+analyze:
+  dart analyze
+
+[group("Dart")]
+[doc("Generate the API documentation.")]
+docs:
+  dart doc
+
+[group("Dart")]
+[doc("Run all tests, optionally filtering by expression.")]
+test *ARGS:
+  dart test {{ if ARGS == "" { "" } else { ARGS } }}
+
+[group("Dart")]
+[doc("Remove build and tool artifacts to start fresh.")]
+clean:
+  rm -rf .dart_tool/
+  rm -rf build/
+  rm -rf target/
+  rm -rf bdk-ffi/target/
+  rm -rf coverage/
+  rm -rf bdk_demo/.dart_tool/
+  rm -rf bdk_demo/build/
+  rm -rf examples/.dart_tool/
+  rm -rf examples/build/