Path.asByteStream() calculates incorrect content length unless endInclusive is specified

[ianbotsf]

Describe the bug

When using the extension method Path.asByteStream() to get a streaming body, the endInclusive parameter must be specified otherwise the content length is incorrectly calculated. The -1 default is passed through to the File.asByteStream() method which in turn passes it to FileContent where its meaning is lost, leading to content lengths of 0 bytes.

This causes streaming bodies to have incorrect lengths calculated leading to errors like:

Exception in thread "main" java.net.ProtocolException: expected 0 bytes but received 8192
	at okhttp3.internal.connection.Exchange$RequestBodySink.write(Exchange.kt:219)
	at okio.RealBufferedSink.emitCompleteSegments(RealBufferedSink.kt:255)
	at okio.RealBufferedSink.write(RealBufferedSink.kt:88)
	at aws.smithy.kotlin.runtime.http.engine.okhttp.ByteChannelRequestBody$writeTo$1.invokeSuspend(ByteChannelRequestBody.kt:51)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)
	at kotlinx.coroutines.EventLoopImplBase.processNextEvent(EventLoop.common.kt:284)
	at kotlinx.coroutines.BlockingCoroutine.joinBlocking(Builders.kt:85)
	at kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking(Builders.kt:59)
	at kotlinx.coroutines.BuildersKt.runBlocking(Unknown Source)
	at aws.smithy.kotlin.runtime.http.engine.okhttp.ByteChannelRequestBody.writeTo(ByteChannelRequestBody.kt:41)
	at okhttp3.internal.http.CallServerInterceptor.intercept(CallServerInterceptor.kt:62)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.kt:109)
	at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.kt:34)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.kt:109)
	at okhttp3.internal.cache.CacheInterceptor.intercept(CacheInterceptor.kt:95)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.kt:109)
	at okhttp3.internal.http.BridgeInterceptor.intercept(BridgeInterceptor.kt:84)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.kt:109)
	at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.kt:65)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.kt:109)
	at okhttp3.internal.connection.RealCall.getResponseWithInterceptorChain$okhttp(RealCall.kt:205)
	at okhttp3.internal.connection.RealCall$AsyncCall.run(RealCall.kt:533)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)

Expected Behavior

Path.asByteStream() should work properly even with no endInclusive parameter specified.