[synctools] Use `EventReader` / `EventWriter` (#1573)

import at.bitfire.davdroid.util.DavUtils.lastSegment

import at.bitfire.ical4android.AndroidEvent

import at.bitfire.ical4android.Event

import at.bitfire.ical4android.EventReader

import at.bitfire.ical4android.EventWriter

import at.bitfire.ical4android.util.DateUtils

import at.bitfire.synctools.exception.InvalidRemoteResourceException

import dagger.assisted.Assisted

import okhttp3.HttpUrl

import okhttp3.RequestBody

import okhttp3.RequestBody.Companion.toRequestBody

import java.io.ByteArrayOutputStream

import java.io.Reader

import java.io.StringReader

import java.io.StringWriter

import java.time.Duration

import java.time.ZonedDateTime

import java.util.logging.Level

            val event = requireNotNull(resource.androidEvent.event)

            logger.log(Level.FINE, "Preparing upload of event ${resource.fileName}", event)

            val os = ByteArrayOutputStream()

            event.write(os, Constants.iCalProdId)

            os.toByteArray().toRequestBody(DavCalendar.MIME_ICALENDAR_UTF8)

            // write iCalendar to string and convert to request body

            val iCalWriter = StringWriter()

            EventWriter(Constants.iCalProdId).write(event, iCalWriter)

            iCalWriter.toString().toRequestBody(DavCalendar.MIME_ICALENDAR_UTF8)

        }

    override suspend fun listAllRemote(callback: MultiResponseCallback) {

    private fun processVEvent(fileName: String, eTag: String, scheduleTag: String?, reader: Reader) {

        val events: List<Event>

        try {

            events = Event.eventsFromReader(reader)

            events = EventReader().readEvents(reader)

        } catch (e: InvalidRemoteResourceException) {

            logger.log(Level.SEVERE, "Received invalid iCalendar, ignoring", e)

            notifyInvalidResource(e, fileName)

androidx-work = "2.10.2"

bitfire-cert4android = "b67ba86d31"

bitfire-dav4jvm = "acbfbacbaf"

bitfire-synctools = "2bef0eee14"

bitfire-synctools = "503324b4fe"

compose-accompanist = "0.37.3"

compose-bom = "2025.06.01"

dnsjava = "3.6.3"