[apkverify] Introduce enums for signature and content digest algorithms

Test: atest libapkverify.test
Bug: 246254355
Change-Id: I18adcb8116341f52a8ca6a7489c589a0d2096c2e
diff --git a/libs/apkverify/src/lib.rs b/libs/apkverify/src/lib.rs
index c5aa9e5..f6c1a21 100644
--- a/libs/apkverify/src/lib.rs
+++ b/libs/apkverify/src/lib.rs
@@ -16,6 +16,7 @@
 
 //! Verifies APK/APEX signing with v2/v3 scheme
 
+mod algorithms;
 mod bytes_ext;
 mod sigutil;
 #[allow(dead_code)]