Initialising the fields as Integer and then getting a String on compute
time is slow. Instead we directly initialise these fields as String.
Improves the time taken in bundling PlayerInfo further to less than
200ms from ~300ms.
Also modified a test to improve productive coverage.
PiperOrigin-RevId: 500003935
(cherry picked from commit 578f2de48f795ad90aafdad645c62fcdbd686e0a)