Epic: Performance enhancements

[brunoborges]

This is an Epic for a set of four performance enhancements.

• Parser bug: Pattern.compile() called per-invocation in GenerationalHeapParser.splitRemarkReferenceWithWeakReferenceSplitBug #567
• Parser: reduce substring + java.time allocation churn in numeric/timestamp parsing #568
• Parser: batch Vert.x eventbus messages to cut per-line envelope allocation #569
• Parser: avoid allocating a fresh Matcher per rule per line in the hot parse path #566