Winscope: Use int-based enums to differentiate log field types

Using a string-based enum that doubles as the display name of the field
type means we cannot have two different types that have the same display
name with different characteristics.

Bug: 332714237
Bug: 210460522
Test: presubmit
Flag: NONE dev tool only
Change-Id: Icac1a459da6ef69734fbd8ce0d29970f64ce297d
21 files changed