Planet enhance

[dfguerrerom]

• fixed #895
• added method to load credentials from file
• add an option to store successful login credentials

To test:

from sepal_ui.planetapi.planet_view import PlanetView

planet_view = PlanetView()
planet_view

[dfguerrerom]

@12rambau , tests fail because gadm files server is down again. All the tests related to this PR passed.

[codecov[bot]]

Codecov Report

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

Comparison is base (b91b2a2) 96.54% compared to head (5292607) 96.58%. Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #896 +/- ## ========================================== + Coverage 96.54% 96.58% +0.03% ========================================== Files 39 39 Lines 3794 3833 +39 ========================================== + Hits 3663 3702 +39 Misses 131 131 ```

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[dfguerrerom]

Done!