Add name option to createContext

[thetarnav]

Context nodes should be able to be named, just as signals and computations.
Without names, context nodes don't have anything besides their value (which takes a second to inspect and identify) to identify different context nodes by.

Such change would need to be added to solid first—createContext doesn't have an option for that.
(PR adding that to solid: solidjs/solid#1266)

Then the debugger would have to be modified to send the name field to the extension.
Since the computations in solid have their name generated if one isn't passed using options, the generated names would have to also be displayed to the user. At least until that behavior is changed.