* make Pair immutable and in google-code-style
* apply google-code-style to JavaTimeFormatter (to make it consistent with most other auto-generated java)
* move upperCaseBearer to ctor (scheme is final and private; only needs to be fixed once); also replaced Optional with ternary (perf and cleaner code)
* apply google-code-style to Authentication to make it consistent with rest of auth code
* fresh samples
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