Allow for subtypes to be sendable

Author: vijaysharm

CodeGen/Sources/LucidCodeGen/Meta/MetaSubtype.swift

@@ -50,6 +50,7 @@ struct MetaSubtype {
         let type = Type(identifier: subtype.typeID())
             .with(accessLevel: .public)
             .adding(inheritedType: .codable)
+            .adding(inheritedType: subtype.sendable ? .sendable : nil)
             .adding(inheritedType: .hashable)
 
         switch subtype.items {

CodeGen/Sources/LucidCodeGenCore/Codable.swift

@@ -757,6 +757,7 @@ extension Subtype: Codable {
         case objc
         case objcNoneCase
         case platforms
+        case sendable
     }
 
     public init(from decoder: Decoder) throws {
@@ -765,6 +766,7 @@ extension Subtype: Codable {
         name = try container.decode(String.self, forKey: .name)
         manualImplementations = Set(try container.decodeIfPresent([`Protocol`].self, forKey: .manualImplementations) ?? [])
         platforms = try container.decodeIfPresent(Set<Platform>.self, forKey: .platforms) ?? DescriptionDefaults.platforms
+        sendable = try container.decodeIfPresent(Bool.self, forKey: .sendable) ?? DescriptionDefaults.sendable
 
         if let usedCases = try container.decodeIfPresent([String].self, forKey: .cases) {
             let unusedCases = try container.decodeIfPresent([String].self, forKey: .unusedCases) ?? []

CodeGen/Sources/LucidCodeGenCore/Descriptions.swift

@@ -645,6 +645,8 @@ public struct Subtype: Equatable {
     public let objc: Bool
 
     public let platforms: Set<Platform>
+    
+    public let sendable: Bool
 }
 
 // MARK: - Conversions