merge raw dataset and mel dataset; support wavlm

[ddlBoJack]

What does this PR do?

1. merge raw dataset and mel dataset, with "dataset_config.input_type" flag
2. support wavlm

Feature/Issue validation/testing

Please describe the tests that you ran to verify your changes and relevant result summary. Provide instructions so it can be reproduced. Please also list any relevant details for your test configuration.

• [ ] Test A Logs for Test A

• [ ] Test B Logs for Test B

Before submitting

• [ ] This PR fixes a typo or improves the docs (you can dismiss the other checks if that's the case).
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• [ ] Was this discussed/approved via a Github issue? Please add a link to it if that's the case.
• [ ] Did you make sure to update the documentation with your changes?
• [ ] Did you write any new necessary tests?

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