Define multialg variants of the libdiced_open_dice targets.

Implements and exports "multialg" alternatives to `keypair_from_seed`
and `derive_cdi_leaf_priv` functions (and a few others).

Bug: 391534773
Test: atest libdiced_open_dice_multialg.integration_test
Change-Id: Ia405ee3fc2c092c750eda9dfa44eb142130ec66b
diff --git a/libs/dice/TEST_MAPPING b/libs/dice/TEST_MAPPING
index a43d7a2..d2d89e4 100644
--- a/libs/dice/TEST_MAPPING
+++ b/libs/dice/TEST_MAPPING
@@ -12,6 +12,9 @@
       "name": "libdiced_open_dice.integration_test"
     },
     {
+      "name": "libdiced_open_dice_multialg.integration_test"
+    },
+    {
       "name": "libdiced_open_dice_nostd.integration_test"
     },
     {