Added Swift language support

[bourquep]

This adds support for Swift 5 code generation, using the official grpc-swift plugin (which itself uses Apple's swift-protobuf code generator plugin).

Possible values for --swift-opt are documented here.

Possible values for --grpc-swift-opt are documented here.

This uses the latest -alpha release of grpc-swift, which is deemed production-ready by the team even though it has the -alpha tag.

[troyswanson]

I'm a user, not a maintainer, but I would love to have this! Thanks 😄

[troyswanson]

It seems as though Apple has an official plugin for this now: https://github.com/apple/swift-protobuf

[bourquep]

It's not quite the same thing. swift-protobuf is a package that can [de]serialize protobuf-encoded messages. grpc-swift is the grpc runtime, allowing to implement grpc clients and servers in Swift.

[jcburley]

@bourquep – if you're still interested in this, please refresh and we'll take a fresh look at merging it. Else, feel free to close it out. Thanks!

[bourquep]

@jcburley We are not using this image anymore, we've switch to using buf.build

But I can still update the PR and have it merged, because there seems to be interest from other folks.

[jcburley]

@jcburley We are not using this image anymore, we've switch to using buf.build

But I can still update the PR and have it merged, because there seems to be interest from other folks.

That's be great, thanks! If possible, please include test coverage and clean up any Codacy stuff.