tests: adding lfe-filter-test

so far, this test only includes rewind test, it works as below:
let lfe-filter process 2 blocks mono lfe channel audio samples, the
sample format is PA_SAMPLE_S16LE, save the processed data to the temp
buffer, then rewind the lfe-filter back 1 block and 1.5 blocks
respectively, reprocess the audio samples from the rewind position,
then comparing the output data with previously saved data.

Signed-off-by: Hui Wang <hui.wang@canonical.com>

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