Let _replace() return a copy of object instead of changing the object
Let _replace() return a copy of object instead of changing the object

The idea is to make DEFAULT_TRT_CONVERSION_PARAMS immutable.
Although this doesn't make it completely immutable but it avoids
changing the object by _replace(), which is the method everyone is
using on DEFAULT_TRT_CONVERSION_PARAMS when it was a NamedTuple.

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