Look at top level function in a condition

[kddejong]

Issue #, if available:
#1221
Description of changes:

• Validate the top level function when defining a condition

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[codecov]

Codecov Report

Merging #1235 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1235      +/-   ##
==========================================
+ Coverage   87.32%   87.33%   +<.01%     
==========================================
  Files         136      136              
  Lines        8058     8062       +4     
  Branches     1982     1984       +2     
==========================================
+ Hits         7037     7041       +4     
  Misses        598      598              
  Partials      423      423

Impacted Files	Coverage Δ
src/cfnlint/rules/conditions/Configuration.py	100% <100%> (ø)	⬆️

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