Add missing fields to AWS::Serverless::Function::ScheduleEvent and remove version from required in IAMPolicyDocument

[jpinkney-aws]

Issue #, if available: Related issue in aws-toolkit-vscode: https://github.com/aws/aws-toolkit-vscode/issues/2765

Description of changes: This PR adds the missing fields for ScheduleEvent and also removes version from required fields in IAMPolicyDocument. I can't find anywhere that explicitly says it must be required

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[codecov-commenter]

Codecov Report

Merging #477 (1731c44) into master (35a4b24) will decrease coverage by 0.10%. The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #477      +/-   ##
=========================================
- Coverage    6.35%   6.25%   -0.11%     
=========================================
  Files          30      30              
  Lines       15582   15582              
=========================================
- Hits          991     974      -17     
- Misses      14570   14586      +16     
- Partials       21      22       +1     

Impacted Files	Coverage Δ
intrinsics/conditions.go	60.46% <0.00%> (-39.54%)	:arrow_down:

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[rubenfonseca]

~~Unfortunately, this is not easy to fix (see my PR where testes are failing). I will need some extra time to think about how to integrate this PR.~~

sorry, commented on the wrong PR

[rubenfonseca]

Thank you for this! I've merged my PR since I couldn't change the commit message from yours.