fix: DictionaryAdapter missing handle scopes and locks #90
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Fixes EddyVerbruggen/nativescript-plugin-firebase#1728, which seems to have been due to thread switching in the callback at FIRFunctions.m#L187. This issue will affect any native library functions called with a JavaScript object which are then wrapped in a DictionaryAdapter, and then attempt to access or enumerate the DictionaryAdapters contents from another thread.
I have not worked in Objective C nor with V8 internals before. This pull request needs a careful review and testing. Thank you @darind for pointing me in the right direction.