Add two new rules to validate fargate tasks

[kddejong]

Issue #, if available:
#3453

Description of changes:

• Add rule E3047 to validate ECS Fargate cpu/memory on a task definition
• Add rule E3048 to validate ECS Fargate properties on a task definition

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.42%. Comparing base (ee6271f) to head (14f9599).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3464      +/-   ##
==========================================
+ Coverage   93.40%   93.42%   +0.01%     
==========================================
  Files         325      327       +2     
  Lines       11087    11125      +38     
  Branches     2327     2329       +2     
==========================================
+ Hits        10356    10393      +37     
  Misses        410      410              
- Partials      321      322       +1     

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[kddejong]

While the schema specifies the values as strings they are integers. These rules will accept both and work accordingly. Tried to favor the string method as much as possible.