Validation annotations on collection items

[walaniam]

This PR is to fix issue with missing constraints on primitive collection items
Example spec:

        arrangementIds:
          description: Internal arrangement ids
          type: array
          items:
            type: string
            minLength: 5
            maxLength: 361

will now generate following code for boat spring generator

      @Valid
        private List<@Size(min = 5, max = 361) String> arrangementIds = new ArrayList<>();

Above change was applied in pojo.mustache by use of collectionDataType.mustache

Additionally tests were refactored by factoring out MavenProjectCompiler and VerificationRunner into separate classes.

[miladbb]

LGTM! just update the changelog please

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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