Logs: Add new methods

[archinksagar]

Adding the following methods for Logs

• create_delivery
• delete_delivery
• delete_delivery_destination
• delete_delivery_destination_policy
• delete_delivery_source
• describe_deliveries
• describe_delivery_destinations
• describe_delivery_sources
• get_delivery
• get_delivery_destination
• get_delivery_destination_policy
• get_delivery_source
• put_delivery_destination
• put_delivery_destination_policy
• put_delivery_source

[codecov]

Codecov Report

Attention: Patch coverage is 98.33333% with 4 lines in your changes missing coverage. Please review.

Project coverage is 92.72%. Comparing base (41dd981) to head (7947a03).
Report is 83 commits behind head on master.

Files with missing lines	Patch %	Lines
moto/logs/models.py	97.54%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8608      +/-   ##
==========================================
+ Coverage   92.65%   92.72%   +0.07%     
==========================================
  Files        1231     1242      +11     
  Lines      106791   107854    +1063     
==========================================
+ Hits        98946   100009    +1063     
  Misses       7845     7845              

Flag	Coverage Δ
servertests	28.17% <12.91%> (+0.10%)	⬆️
unittests	92.70% <98.33%> (+0.07%)	⬆️

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[bblommers]

LGTM - thank you for the (continued) contributions @archinksagar!