Add warnings and raised errors for `add_location`

[ctuguinay]

Add warnings for add_location for NaN/0 lat/lon and duplicated timestamps to address the following issues: Strange GPS coordinates appearing with add_location() method #1286 add_location fails with duplicated timestamps in GPS data #1294

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.66%. Comparing base (9f56124) to head (c8e5ef5). Report is 41 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1296 +/- ## ========================================== + Coverage 83.52% 91.66% +8.14% ========================================== Files 64 3 -61 Lines 5686 168 -5518 ========================================== - Hits 4749 154 -4595 + Misses 937 14 -923 ``` | [Flag](https://app.codecov.io/gh/OSOceanAcoustics/echopype/pull/1296/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=OSOceanAcoustics) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/OSOceanAcoustics/echopype/pull/1296/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=OSOceanAcoustics) | `91.66% <100.00%> (+8.14%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=OSOceanAcoustics#carryforward-flags-in-the-pull-request-comment) to find out more.

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[ctuguinay]

Oh wait, I'll add some tests to cover these scenarios.

[ctuguinay]

@leewujung This PR should be ready for review now

[ctuguinay]

@leewujung Made the switch from warning to raised value error. This should be ready for a quick review again.