feat: per product_type download conf and earth_search_cog merged into earth_search

[sbrunato]

Fixes #364

• Download configuration can be set per product type (and not only provider)
• earth_search_cog provider merged into earth_search which now also handles S2_MSI_L2A_COG product type

[github-actions]

Unit Test Results

    2 files  ±0      2 suites  ±0   8m 48s ⏱️ - 3m 23s
244 tests +2  240 ✔️ ±0  2 💤 ±0  2 ❌ +2 
488 runs  +4  482 ✔️ +2  4 💤 ±0  2 ❌ +2 

For more details on these failures, see this check.

Results for commit 12eba72. ± Comparison against base commit 99db80a.

♻️ This comment has been updated with latest results.

[github-actions]

File	Coverage
All files	79%	✅
eodag/cli.py	73%	✅
eodag/config.py	89%	✅
eodag/api/core.py	86%	✅
eodag/api/product/metadata_mapping.py	78%	✅
eodag/plugins/manager.py	81%	✅
eodag/plugins/download/http.py	36%	❌
tests/units/test_core.py	97%	✅

File	Coverage
All files	78%	✅
eodag/cli.py	73%	✅
eodag/config.py	89%	✅
eodag/api/core.py	86%	✅
eodag/api/product/metadata_mapping.py	78%	✅
eodag/plugins/manager.py	81%	✅
eodag/plugins/download/http.py	36%	❌
tests/units/test_core.py	97%	✅
eodag/cli.py	72%	✅
eodag/config.py	89%	✅
eodag/api/core.py	85%	✅
eodag/api/product/metadata_mapping.py	76%	✅
eodag/plugins/manager.py	83%	✅
eodag/plugins/download/http.py	36%	❌
tests/units/test_core.py	98%	✅

Minimum allowed coverage is 70%

Generated by 🐒 cobertura-action against 12eba72