fix(elementTemplate): edit element-template-generation-plugin

[peterhnm]

• better visibility if a field is a inputParameter or outputParameter
• interrupt generation and log error when no targetPlatform is given
• set version type to int
• remove targetPlatform as output directory

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 88.05970% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 45.12%. Comparing base (bfe9320) to head (defbe29).

Files	Patch %	Lines
...ttemplate/c7/Camunda7ElementTemplateGenerator.java	92.00%	1 Missing and 1 partial :warning:
...ttemplate/c8/Camunda8ElementTemplateGenerator.java	91.66%	1 Missing and 1 partial :warning:
.../elementtemplate/ElementTemplateGeneratorMojo.java	80.00%	1 Missing and 1 partial :warning:
...template/core/ElementTemplateGenerationResult.java	66.66%	1 Missing :warning:
...lementtemplate/core/ElementTemplateInfoMapper.java	0.00%	0 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #365 +/- ## ============================================ + Coverage 45.07% 45.12% +0.05% + Complexity 383 382 -1 ============================================ Files 184 185 +1 Lines 2021 2052 +31 Branches 106 110 +4 ============================================ + Hits 911 926 +15 - Misses 1079 1090 +11 - Partials 31 36 +5 ``` | [Flag](https://app.codecov.io/gh/Miragon/miranum/pull/365/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Miragon) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/Miragon/miranum/pull/365/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Miragon) | `45.12% <88.05%> (+0.05%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Miragon#carryforward-flags-in-the-pull-request-comment) to find out more.

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