Incorrect check for waveform_mode and encode_mode parameters in compute_sv()

[simedroniraluca]

The current implementation of compute_sv() requires that the optional parameters waveform_mode and encode_mode appear exclusively for EK80. However, this behavior is not entirely correct.

Expected Behavior:

1. For EK80: Both waveform_mode and encode_mode are required.
2. For EK60: While these parameters can be present, they have a fixed configuration of waveform_mode="CW" and encode_mode="power".

Current Behavior:
The function raises an error if waveform_mode and encode_mode are present for EK60, even if they have the correct configuration.

Suggested Fix:
Update the checks in compute_sv() to account for the possibility of these parameters being present in the EK60 case with the previously mentioned configuration.

[simedroniraluca]

We only have clear info about the EK80 for waveform_mode and encode_mode. So, I'm only setting rules for EK80. Check the documentation here. We're not totally sure if all EK60 types use the same settings for these parameters.

[ruxandra-valcu]

Because all EK60 echosounders are narrowband devices, they will all use "CW" and "power"

[simedroniraluca]

Because of the phrases emphasized in the image below, taken from echopype documentation for computing Sv, I do not add checks on other instruments besides EK80. We do not know everything about all types of EK60. We will use our assumption that "For EK60: While these parameters can be present, they have a fixed configuration of waveform_mode='CW' and encode_mode='power', but not in checks.

[simedroniraluca]

#46

[ruxandra-valcu]

Fixed