[REQ] Please add `endsWith` helper for handlebars templates

Created by: averche

Is your feature request related to a problem? Please describe.

I would like to conditionally generate code using handlebars templates for tags ending with a specific value.

Today, the openapi-generator supports startsWith but not the equivalent endsWith helper function:

https://github.com/OpenAPITools/openapi-generator/blob/d90bdcbec712130d157cd6331bcbbf2e093df8d3/modules/openapi-generator/src/main/java/org/openapitools/codegen/templating/handlebars/StringHelpers.java#L12-L65

Describe the solution you'd like

Support for a helper endsWith that acts just like the startsWith but for suffixes would be ideal:

     {{#endsWith myTag "my-suffix"}}
        yes
     {{else}}
        no
     {{/endsWith}}

Describe alternatives you've considered

I've tried using an approximate solution of {{#neq myTag (cut myTag "my-suffix")}} in my handlebars templates. Unfortunately this doesn't work as expected (it always returns true).