feat: draft async get assets

[dfguerrerom]

from the current recursive function implementation the time to load 100 assets stored in multiple folders, the time was:

####################### Recursive #######################
Execution time: 13.889884233474731 seconds

By using the suggested implementation we could improve the result by 80%.

####################### Async Concurrent 2 #######################
Execution time: 2.823052406311035 seconds

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 90.24390% with 4 lines in your changes missing coverage. Please review.

Project coverage is 96.50%. Comparing base (8a347a5) to head (4ce5069).

Files	Patch %	Lines
sepal_ui/scripts/gee.py	90.24%	4 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #934      +/-   ##
==========================================
- Coverage   96.64%   96.50%   -0.15%     
==========================================
  Files          39       39              
  Lines        3964     4003      +39     
==========================================
+ Hits         3831     3863      +32     
- Misses        133      140       +7     

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[dfguerrerom]

It works but I don't want to dispatch threads to process the requests, I would like to create a fully asyncio call...

[dfguerrerom]

Adding max_concurrent_tasks parameter with a semaphore I think will be enough to be sure this feature won't cause any issue. I will merge this PR and later I will open a new one once dfguerrerom/ee-client#3 integrates this changes.