fix: wrap invalid JS property names in quotes

[mukaschultze]

Some libs (e.g., okhttp) have methods with names that generate invalid typescript code, this PR fixes this by wrapping invalid fields and methods names in quotes

Example:

-       public -deprecated_proxy(): java.net.Proxy;
+       public "-deprecated_proxy"(): java.net.Proxy;

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[mukaschultze]

@cla-bot check

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