Add learner tests for SAC and TD3 agents#369
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SAC and TD3 are two of the most commonly used continuous control agents in Acme, but neither has a learner test. This adds parameterized integration tests for both.
The SAC test covers adaptive and fixed entropy coefficient modes, since those take different code paths through
SACLearner(the adaptive case initializes and updates a separate alpha optimizer). The TD3 test covers standard TD3 and the TD3+BC variant (bc_alphaset), since that changes the policy loss computation.Both follow the same pattern as the existing tests in
crr/andcql/: fake continuous environment, fake transition iterator, small hidden layers to keep runtime low.