Bugfix: Massive block heights causing OOM with historical block flow

[hyperschwartz]

Description

When an incredibly large block range is sent into the historical block flow, all of the height values are converted to a list and then immediately chunked, causing an OOM in some circumstances:

java.lang.OutOfMemoryError: Java heap space
	at kotlin.collections.CollectionsKt___CollectionsKt.windowed(_Collections.kt:3333)
	at kotlin.collections.CollectionsKt___CollectionsKt.chunked(_Collections.kt:3115)
	at tech.figure.eventstream.stream.flows.HistoricalBlockHeaderFlowKt$toBlockMeta$1.invokeSuspend(HistoricalBlockHeaderFlow.kt:91)
	at tech.figure.eventstream.stream.flows.HistoricalBlockHeaderFlowKt$toBlockMeta$1.invoke(HistoricalBlockHeaderFlow.kt)
	at tech.figure.eventstream.stream.flows.HistoricalBlockHeaderFlowKt$toBlockMeta$1.invoke(HistoricalBlockHeaderFlow.kt)

This fix creates a sequence of the incoming values for processing, instead of converting the entire input range to a list in the first place.