improve support of local bot api servers

tgbotapi.core/src/mingwX64Main/kotlin/bot/ktor/base/FileResolver.mingwX64.kt

@@ -0,0 +1,12 @@
+package dev.inmo.tgbotapi.bot.ktor.base
+
+import dev.inmo.micro_utils.common.MPPFile
+import okio.FileSystem
+import okio.Path
+import okio.Path.Companion.toPath
+
+internal actual fun resolveFile(filename: String): MPPFile? = runCatching {
+    with(Path) { filename.toPath() }.takeIf {
+        FileSystem.SYSTEM.exists(it) && FileSystem.SYSTEM.metadata(it).isRegularFile
+    }
+}.getOrElse { null }