add issue template «make a new release»

[mesilov]

Add new issue template «make a new SDK release»

inputs

• version
• changelog
• default fields

checklist in issue

• write release notes documentation in the changelog.MD
• update version in all code examples in main README.md
• update the version in headers in the file /src/Core/ApiClient.php
• update version in examples folder
• checkout each example with release branch and test it
• rebuild the list of the supported methods in SDK documentation
• local pass phpstan linter
• local pass rector linter
• local pass PHPUnit tests
• pass all integration tests by scope