Draft: Credentials encryption

[CGuichard]

Closes #60

[github-actions]

Unit Test Results

    2 files  ±  0      2 suites  ±0   13m 34s ⏱️ +37s
265 tests +31  263 ✔️ +31  2 💤 ±0  0 ❌ ±0 
530 runs  +62  526 ✔️ +62  4 💤 ±0  0 ❌ ±0 

Results for commit 09b741d. ± Comparison against base commit c6dfc7e.

♻️ This comment has been updated with latest results.

[github-actions]

File	Coverage
All files	79%	✅
eodag/cli.py	78%	✅
eodag/config.py	91%	✅
eodag/api/core.py	87%	✅
tests/units/test_security.py	86%	✅
tests/units/test_utils.py	95%	✅

File	Coverage
All files	79%	✅
eodag/cli.py	78%	✅
eodag/config.py	91%	✅
eodag/api/core.py	87%	✅
tests/units/test_security.py	86%	✅
tests/units/test_utils.py	95%	✅
eodag/cli.py	78%	✅
eodag/config.py	90%	✅
eodag/api/core.py	87%	✅
tests/units/test_security.py	86%	✅
tests/units/test_utils.py	95%	✅

Minimum allowed coverage is 70%

Generated by 🐒 cobertura-action against 09b741d