long, double and boolean support for observations #234 #238
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@marcingrzejszczak could you please take a look on eb11083? If we will find consensus on this, I will include fixed version in #235.
Probably this change should be in micrometer-common, but I feel that KeyValue object has wide semantic and custom types might not be applicable for metrics tag for example, that's why I put this in tracing and asking your advice.