Add GetName() func to Signal Chanel to return human readable name

[ilewin]

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Is your feature request related to a problem? Please describe. While dynamically creating signal channels and assigning callback functions to it, it is not possible to identify the channel name in the callback funciton

Describe the solution you'd like adding a GetName() string func to the Chanel interface

[Quinn-With-Two-Ns]

Why can't you add the name when creating the callback? Normal Go channels don't support a name so I am not sure Temporal channels would need such a functionality

[Quinn-With-Two-Ns]

If we did want to include name, probably makes sense to group with other signal info https://github.com/temporalio/temporal/issues/5874