Generators, adjusts storage of exclusiveMaximum/exclusiveMinimum [breaking]

[spacether]

Generators, adjusts storage of CodegenSchema exclusiveMaximum/exclusiveMinimum

• changes maximum/minimum types from String to BigDecimal to be consistent with openapi 3.1.0 types
• changes exclusiveMaximum/exclusiveMinimum types from Boolean to BigDecimal to be consistent with openapi 3.1.0 types
• also adds org.codehaus.janino dependency back in because it is needed for conditions in the logging config
• adds java tests of schema processing for exclusiveMin/Maximum for 3.0.0/30.03/3.1.0 documents
• python schema class generation improved with isSImpleX helper methods that were developed and used in java templates

Breaking Change with Fallback

• this is a breaking change with fallback for templates that used maximum/minimum/exclusiveMaximum/exclusiveMinimum
• if one depended on the old variables, one can adjust your template logic using the new values. What was {{#if exclusiveMaximum}} would now need {{#neq exclusiveMaximum null}}

PR checklist

• Read the contribution guidelines.
• Pull Request title clearly describes the work in the pull request and Pull Request description provides details about how to validate the work. Missing information here may result in delayed response from the community.
• Run the following to build the project and update samples:

  mvn clean package 
  ./bin/generate-samples.sh
  ./bin/utils/export_docs_generators.sh
  

  Commit all changed files.
  This is important, as CI jobs will verify all generator outputs of your HEAD commit as it would merge with master.
  These must match the expectations made by your contribution.
  You may regenerate an individual generator by passing the relevant config(s) as an argument to the script, for example ./bin/generate-samples.sh bin/configs/python*.
  For Windows users, please run the script in Git BASH.