Clean up extension types API, introduce json text subtype #1054
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This PR cleans up some comments in the extension API and prevents extensions themselves from calling 'free' on Value types that are exposed to the user facing traits, as well as changes the
from_ffi
method for OwnedValues to take ownership and automatically free the values to prevent memory leaks.This PR also finds the name of the
args: &[Value]
argument for scalar functions in extensions, and uses that in the proc macro, instead of relying on documentation to communicate that the parameter must be namedargs
.