New Plugins

[sebsto]

This is a set of new plugins to help user to get started: lambda-init, lambda-build, lambda-deploy

Motivation:

See this proposal:
https://github.com/swift-server/swift-aws-lambda-runtime/blob/main/Plugins/Documentation.docc/Proposals/0001-v2-plugins.md

Modifications:

The plugin code is minimal, just a wrapper around a CLI executable defined in a new target.

        //
        // The plugins
        // 'lambda-init' creates a new Lambda function
        // 'lambda-build' packages the Lambda function
        // 'lambda-deploy' deploys the Lambda function
        //
        //  Plugins requires Linux or at least macOS v15
        //

        // plugin to create a new Lambda function, based on a template
        .plugin(name: "AWSLambdaInitializer", targets: ["AWSLambdaInitializer"]),

        // plugin to package the lambda, creating an archive that can be uploaded to AWS
        .plugin(name: "AWSLambdaBuilder", targets: ["AWSLambdaBuilder"]),

        // plugin to deploy a Lambda function
        .plugin(name: "AWSLambdaDeployer", targets: ["AWSLambdaDeployer"]),

        .plugin(
            name: "AWSLambdaInitializer",
            capability: .command(
                intent: .custom(
                    verb: "lambda-init",
                    description:
                        "Create a new Lambda function in the current project directory."
                ),
                permissions: [
                    .writeToPackageDirectory(reason: "Create a file with an HelloWorld Lambda function.")
                ]
            ),
            dependencies: [
                .target(name: "AWSLambdaPluginHelper")
            ]
        ),

(repeated for each plugin)

And a common command line helper

        .executableTarget(
            name: "AWSLambdaPluginHelper",
            dependencies: [
                .product(name: "NIOHTTP1", package: "swift-nio"),
                .product(name: "NIOCore", package: "swift-nio"),
            ]
        ),

Result:

Three new plugins available.
TODO: add plugin output for a full init, build, deploy cycle.

[sebsto]

Issue tracker #566