[TeX] Extracted Utils API for Telemetry Express Logging APIs

- hashString API moved to utils to be used by Histogram metric APIs

Bug: 262791652
Test: m
Change-Id: Ic049083c6e19c045e6f743e3bc96e1fc15ed4533
Merged-In: Ic049083c6e19c045e6f743e3bc96e1fc15ed4533
5 files changed