Add approximate trimming to reactive stream extensions

[Quantum64]

This change adds the approximateTrimming option to the reactive stream operations coroutines extension. I do not think this change warrants an additional test case since this function is already covered, but let me know if it does.

The @JvmOverloads annotation was added to maintain compatibility with previous versions of this class. Binary compatibility is maintained, so this change is fully compatible and non-breaking. Binary compatibility was confirmed using the javap command.

Before

public static final <K, HK, HV> java.lang.Object trimAndAwait(org.springframework.data.redis.core.ReactiveStreamOperations<K, HK, HV>, K, long, kotlin.coroutines.Continuation<? super java.lang.Long>);

After

public static final <K, HK, HV> java.lang.Object trimAndAwait(org.springframework.data.redis.core.ReactiveStreamOperations<K, HK, HV>, K, long, boolean, kotlin.coroutines.Continuation<? super java.lang.Long>);
public static java.lang.Object trimAndAwait$default(org.springframework.data.redis.core.ReactiveStreamOperations, java.lang.Object, long, boolean, kotlin.coroutines.Continuation, int, java.lang.Object);
public static final <K, HK, HV> java.lang.Object trimAndAwait(org.springframework.data.redis.core.ReactiveStreamOperations<K, HK, HV>, K, long, kotlin.coroutines.Continuation<? super java.lang.Long>);

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[mp911de]

Thank you for your contribution. That's merged, polished, and backported now.