Replace java.time APIs with kotlin(x).(date)time (#3001)

* Replace java.time APIs with kotlin(x).(date)time

kotlinx-datetime explicitly says in its README that it does not cover
i18n, so we have to stick with using their toJavaX converters wherever
we localise dates and times.

Yes, some of these replacements are... questionable. But I wanted to
try and maximise the replacement for now.

* Bump kotlinx-datetime to 0.8.0

* More kotlin.time/kotlinx-datetime replacements

* Remove redundant init block & make attributes val

* Replace new use of java.time.Instant

core/common/src/main/kotlin/eu/kanade/tachiyomi/network/NetworkHelper.kt

@@ -8,7 +8,8 @@ import okhttp3.Cache
 import okhttp3.OkHttpClient
 import okhttp3.logging.HttpLoggingInterceptor
 import java.io.File
-import java.util.concurrent.TimeUnit
+import kotlin.time.Duration.Companion.minutes
+import kotlin.time.Duration.Companion.seconds
 
 class NetworkHelper(
     private val context: Context,
@@ -20,9 +21,9 @@ class NetworkHelper(
     private val clientBuilder: OkHttpClient.Builder = run {
         val builder = OkHttpClient.Builder()
             .cookieJar(cookieJar)
-            .connectTimeout(30, TimeUnit.SECONDS)
-            .readTimeout(30, TimeUnit.SECONDS)
-            .callTimeout(2, TimeUnit.MINUTES)
+            .connectTimeout(30.seconds)
+            .readTimeout(30.seconds)
+            .callTimeout(2.minutes)
             .cache(
                 Cache(
                     directory = File(context.cacheDir, "network_cache"),

core/common/src/main/kotlin/eu/kanade/tachiyomi/network/Requests.kt

@@ -9,9 +9,9 @@ import okhttp3.HttpUrl
 import okhttp3.HttpUrl.Companion.toHttpUrl
 import okhttp3.Request
 import okhttp3.RequestBody
-import java.util.concurrent.TimeUnit.MINUTES
+import kotlin.time.Duration.Companion.minutes
 
-private val DEFAULT_CACHE_CONTROL = CacheControl.Builder().maxAge(10, MINUTES).build()
+private val DEFAULT_CACHE_CONTROL = CacheControl.Builder().maxAge(10.minutes).build()
 private val DEFAULT_HEADERS = Headers.Builder().build()
 private val DEFAULT_BODY: RequestBody = FormBody.Builder().build()