Ensure the _dd.p.tid tag has fixed size #3729
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This PR ensures that the ruby tracer is compliant when populating the span tag
_dd.p.tid, making sure that when this tag is serialized as a hexagonal String, it is padded with zeros, always having 16 characters.This tag contains the high-order bits (most significant bits) of a 128 bit trace ID, and having it as a fixed sized String is a protocol specification across all tracer languages.