Limit length of variable types when displaying, add option to control

[kpvdr]

Add an option to control the maximum length of variable-length values. The output should contain all the value bytes if the length is less than the threshold, otherwise it should be shortened to the first several bytes, followed by an ellipsis, followed by the last several bytes and a length indicator. eg:

[0210] s amqp-value: binary(54 68 65 20 71 ... 36 37 38 39 2e) len=2048

A default threshold should be 50 bytes, and if greater, then the first and last 25 bytes should be shown.
This should apply to all variable types: Binary, String, Symbol, and to the compound types in both the number of elements shown and the size of each element: List, Map, Array.

[kpvdr]

Still need to expose options to control this feature or turn it off entirely.