add package: pyproject + src (authorizer CLI, json/mongo storage, gated capability flag)

Signed-off-by: disqualifier <dev@disqualifier.me>

pyproject.toml

@@ -0,0 +1,27 @@
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
+[project]
+name = "envelope_authorizer"
+version = "0.1.0"
+description = "CLI key-authorization manager for envelope_crypto"
+requires-python = ">=3.10"
+dependencies = [
+    "envelope_crypto @ git+ssh://git@git.rethinkstudios.io/rethink-public/envelope_crypto.git@v0.1.0",
+    "tomli>=2.0; python_version<'3.11'",
+]
+
+[project.optional-dependencies]
+mongo = [
+    "mongo @ git+ssh://git@git.rethinkstudios.io/rethink-public/mongo.git@v0.1.0",
+]
+
+[project.scripts]
+authorizer = "envelope_authorizer.__main__:main"
+
+[tool.hatch.metadata]
+allow-direct-references = true
+
+[tool.hatch.build.targets.wheel]
+packages = ["src/envelope_authorizer"]