Change name of property from extractionDate to creationDate.

Based on schema review feedback.

Author: dempseyatgithub

Sources/EvolutionMetadataExtraction/Extractors/EvolutionMetadataExtractor.swift

@@ -58,7 +58,7 @@ struct EvolutionMetadataExtractor {
         let formattedExtractionDate = extractionJob.extractionDate.formatted(.iso8601)
 
         return EvolutionMetadata(
-            extractionDate: formattedExtractionDate,
+            creationDate: formattedExtractionDate,
             implementationVersions: implementationVersions,
             proposals: combinedProposals,
             commit: extractionJob.branchInfo?.commit.sha ?? "",

Sources/EvolutionMetadataModel/EvolutionMetadata.swift

@@ -11,14 +11,14 @@ import Foundation
 
 public struct EvolutionMetadata: Equatable, Sendable, Codable {
     public static let schemaVersion = "0.1.0"
-    public var extractionDate: String
+    public var creationDate: String
     public var implementationVersions: [String]
     public var proposals: [Proposal]
     public var commit: String
     public var schemaVersion: String
     public var toolVersion: String
-    public init(extractionDate: String, implementationVersions: [String], proposals: [Proposal], commit: String, toolVersion: String) {
-        self.extractionDate = extractionDate
+    public init(creationDate: String, implementationVersions: [String], proposals: [Proposal], commit: String, toolVersion: String) {
+        self.creationDate = creationDate
         self.implementationVersions = implementationVersions
         self.proposals = proposals
         self.schemaVersion = EvolutionMetadata.schemaVersion