Change context options to a type-safe option with generics. #3132
+97
−60
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Pay technical debt from #3075: make context options type safe.
The options are now a simplified version of similar option implementations: An Option class and a wrapper around a map of the options allows us to remove the type cast when getting options. This was done this way (as opposed to a specific class with getters) in order to support the merging of options in ConfigWithOptions.