Add flashbax support

This gives us a JAX experience buffer for Soft Actor-Critic.

Add jaxtyping in too so we can type things better.

Change-Id: I4c9f0071f9e912dcab0c883da8d9d7990ed06c46
Signed-off-by: Austin Schuh <austin.linux@gmail.com>
diff --git a/tools/python/requirements.txt b/tools/python/requirements.txt
index e7f23c3..2b806f5 100644
--- a/tools/python/requirements.txt
+++ b/tools/python/requirements.txt
@@ -25,9 +25,13 @@
 bokeh
 tabulate
 
+flask
+
 casadi>=3.6.6
 
+# ML libraries
 jax[cuda12]
+jaxtyping
 optax
 flax
 clu
@@ -38,4 +42,5 @@
 tensorflow
 tensorflow_datasets
 
-flask
+# Experience buffer for reinforcement learning
+flashbax