feat: make forEachDB action suspending, remove redundant runBlocking

Change the action lambda to `suspend (EventStore) -> Unit` so callers
can use suspend functions directly. Remove the now-unnecessary
runBlocking wrapper around delay() in ExpirationTest.

https://claude.ai/code/session_01TQRzVTAXBVWRGstcsapA5F

quartz/src/commonTest/kotlin/com/vitorpamplona/quartz/nip01Core/store/sqlite/BaseDBTest.kt

@@ -75,7 +75,7 @@ open class BaseDBTest {
         dbs.forEach { it.value.close() }
     }
 
-    fun forEachDB(action: (EventStore) -> Unit) =
+    fun forEachDB(action: suspend (EventStore) -> Unit) =
         runBlocking {
             dbs.forEach { (key, value) ->
                 launch(Dispatchers.Default) {

quartz/src/commonTest/kotlin/com/vitorpamplona/quartz/nip01Core/store/sqlite/ExpirationTest.kt

@@ -27,7 +27,6 @@ import com.vitorpamplona.quartz.nip10Notes.TextNoteEvent
 import com.vitorpamplona.quartz.nip40Expiration.expiration
 import com.vitorpamplona.quartz.utils.TimeUtils
 import kotlinx.coroutines.delay
-import kotlinx.coroutines.runBlocking
 import kotlin.test.Test
 import kotlin.test.assertFailsWith
 
@@ -59,9 +58,7 @@ class ExpirationTest : BaseDBTest() {
 
             db.assertQuery(noteToExpire, Filter(ids = listOf(noteToExpire.id)))
 
-            runBlocking {
-                delay(2000)
-            }
+            delay(2000)
 
             db.deleteExpiredEvents()