refactor: optimisation around stoptimes

- moved stoptime related functionality into new core:data:stoptime module
  - will feature all the different realtime stoptime sources to be
      integrated later
- create proper database schema for future migrations
- deduplicate trips into stoppingpatterns, since many trips share the
  exact same stopping pattern
  - stoptimes are now linked to stoppingpatterns instead
  - stoppingpattern ids are generated from a hash composed of all stoptimes
- stoptimes now use deltas for arrival time to save space

core/data/stoptime/build.gradle.kts

@@ -0,0 +1,60 @@
+import org.jetbrains.kotlin.gradle.dsl.JvmTarget
+
+plugins {
+    alias(libs.plugins.kotlinMultiplatform)
+    alias(libs.plugins.kotlinSerialization)
+    alias(libs.plugins.androidMultiplatformLibrary)
+    alias(libs.plugins.ksp)
+}
+
+kotlin {
+    android {
+        namespace = "moe.lava.banksia.core.data.stoptime"
+        compileSdk = libs.versions.android.compileSdk.get().toInt()
+
+        compilerOptions {
+            jvmTarget.set(JvmTarget.JVM_11)
+        }
+    }
+
+    compilerOptions {
+        freeCompilerArgs.add("-opt-in=kotlin.time.ExperimentalTime")
+        freeCompilerArgs.add("-Xexpect-actual-classes")
+    }
+
+    iosArm64()
+    iosSimulatorArm64()
+
+    jvm()
+
+    sourceSets {
+        val clientMain by creating {
+            dependsOn(commonMain.get())
+        }
+
+        androidMain.get().dependsOn(clientMain)
+        iosArm64Main.get().dependsOn(clientMain)
+        iosSimulatorArm64Main.get().dependsOn(clientMain)
+
+        androidMain.dependencies {
+            implementation(libs.ktor.client.okhttp)
+        }
+        commonMain.dependencies {
+            implementation(libs.okio)
+            implementation(libs.koin.core)
+            implementation(libs.ktor.client.core)
+            implementation(libs.ktor.client.contentnegotiation)
+            implementation(libs.ktor.serialization.kotlinx.json)
+            implementation(libs.kotlinx.coroutines.core)
+            implementation(libs.kotlinx.datetime)
+            implementation(libs.kotlinx.serialization.json)
+            implementation(libs.kotlinx.serialization.protobuf)
+
+            implementation(projects.core)
+            implementation(projects.core.sqld)
+        }
+        iosMain.dependencies {
+            implementation(libs.ktor.client.darwin)
+        }
+    }
+}