standardize formatting (#3)

motivation: prepare for CI

changes:
* add default swiftformat settings and apply them
* update linux generation script to conform to formatting rules

Author: tomerd

.swiftformat

@@ -0,0 +1,13 @@
+# file options
+
+--exclude .build
+
+# format options
+
+--self insert
+--patternlet inline
+--stripunusedargs unnamed-only
+--comments ignore
+--ifdef no-indent
+
+# rules

IntegrationTests/tests_01_actor/test_01_resources/shared.swift

@@ -12,15 +12,14 @@
 //
 //===----------------------------------------------------------------------===//
 
-import Foundation
 import DistributedActors
+import Foundation
 
 // Just consume the argument.
 // It's important that this function is in another module than the tests
 // which are using it.
 @inline(never)
-public func blackHole<T>(_ x: T) {
-}
+public func blackHole<T>(_: T) {}
 
 // Return the passed argument without letting the optimizer know that.
 @inline(never)

IntegrationTests/tests_01_actor/test_01_resources/test_002_actor_spawn_100.swift

@@ -14,13 +14,12 @@
 
 import DistributedActors
 
-
 func run(identifier: String) {
     let system = ActorSystem("\(identifier)")
 
     measure(identifier: identifier) {
         var i = 0
-        for _ in 0..<100 {
+        for _ in 0 ..< 100 {
             let _: ActorRef<String> = try! system.spawn(.anonymous, .ignore)
             i += 1
         }

IntegrationTests/tests_01_actor/test_01_resources/test_003_actor_spawn_1000.swift

@@ -14,13 +14,12 @@
 
 import DistributedActors
 
-
 func run(identifier: String) {
     let system = ActorSystem("\(identifier)")
 
     measure(identifier: identifier) {
         var i = 0
-        for _ in 0..<1000 {
+        for _ in 0 ..< 1000 {
             let _: ActorRef<String> = try! system.spawn(.anonymous, .ignore)
             i += 1
         }

IntegrationTests/tests_01_actor/test_01_resources/todo_test_004_actor_pingPong_1000.swift

@@ -14,12 +14,11 @@
 
 import DistributedActors
 
-
 func run(identifier: String) {
     let system = ActorSystem("\(identifier)")
 
     measure(identifier: identifier) {
-        // TODO replicate ping pong benchmark here, so we know how much a message send allocates
+        // TODO: replicate ping pong benchmark here, so we know how much a message send allocates
     }
 
     system.shutdown()

Package.swift

@@ -15,18 +15,17 @@ let targets: [PackageDescription.Target] = [
             "DistributedActorsConcurrencyHelpers",
             "CDistributedActorsMailbox",
             "CDistributedActorsRunQueue",
-            "SwiftProtobuf"
+            "SwiftProtobuf",
         ]
     ),
 
     .target(
         name: "DistributedActorsSampleProcessIsolated",
         dependencies: [
-            "DistributedActors"
+            "DistributedActors",
         ]
     ),
 
-    
     /// This target is intended only for use in tests, though we have no way to mark this
     .target(
         name: "DistributedActorsTestKit",
@@ -45,8 +44,7 @@ let targets: [PackageDescription.Target] = [
 
     // NOT SUPPORTED transient library until Swift receives Atomics
     .target(name: "CDistributedActorsAtomics",
-        dependencies: []
-    ),
+            dependencies: []),
 
     // NOT SUPPORTED transient library until Swift receives Atomics
     .target(
@@ -79,8 +77,8 @@ let targets: [PackageDescription.Target] = [
     .target(
         name: "DistributedActorsBenchmarks",
         dependencies: [
-            "DistributedActors", 
-            "SwiftBenchmarkTools"
+            "DistributedActors",
+            "SwiftBenchmarkTools",
         ]
     ),
     .target(
@@ -105,15 +103,15 @@ let targets: [PackageDescription.Target] = [
     .testTarget(
         name: "DistributedActorsDocumentationTests",
         dependencies: ["DistributedActors", "DistributedActorsTestKit"]
-    )
+    ),
 ]
 
 let dependencies: [Package.Dependency] = [
-    .package(url: "https://github.com/apple/swift-nio.git",        from: "2.7.0"),
+    .package(url: "https://github.com/apple/swift-nio.git", from: "2.7.0"),
     .package(url: "https://github.com/apple/swift-nio-extras.git", from: "1.2.0"),
-    .package(url: "https://github.com/apple/swift-nio-ssl.git",    from: "2.2.0"),
-    .package(url: "https://github.com/apple/swift-protobuf.git",   from: "1.4.0"),
-    .package(url: "https://github.com/apple/swift-log.git",        from: "1.0.0"),
+    .package(url: "https://github.com/apple/swift-nio-ssl.git", from: "2.2.0"),
+    .package(url: "https://github.com/apple/swift-protobuf.git", from: "1.4.0"),
+    .package(url: "https://github.com/apple/swift-log.git", from: "1.0.0"),
 ]
 
 let package = Package(