Replace conformer Encoder with an LSTM encoder #159
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tensorboard log: https://tensorboard.dev/experiment/F9QAneF4T9GDGO1Pino5BA/
Note: The training speed seems to be 2x slower than that of using a conformer encoder. The number of parameters
of the two models is nearly equal, i.e., 89188340 (this PR), vs 84007924 (using conformer encoder)