Keystore2.0 database.rs: Add storing and loading key parameters.

This patch adds functionality for storing and loading key parameters.
It also normalizes import names of generated types by importing
SecurityLevel as SecurityLevelType.

It also breaks out loading blob components into its own helper
function.

Bug: 159370859
Test: keystore2_test
Change-Id: I2969c7c467cb3ae9cf8c283122a6f82f775cad37
2 files changed