fix: name clashes with FunC keywords for struct constructor parameters

[anton-trunov]

Closes #466

• I have updated CHANGELOG.md
• I have added tests to demonstrate the contribution is correctly implemented: this usually includes both positive and negative tests, showing the happy path(s) and featuring intentionally broken cases
• I have run all the tests locally and no test failure was reported
• I have run the linter, formatter and spellchecker
• I did not do unrelated and/or undiscussed refactorings

[novusnota]

Cool, but seems like this ties us to FunC even more. Maintenance of the keyword list may bring occasional bugs in the future. I wonder if we could use different names, like prefixing things with underscores or even UUID's of sort?

[anton-trunov]

Cool, but seems like this ties us to FunC even more.

No, it does not, it does quite the opposite. The test shows you can use all current FunC keywords as your struct field identifiers. And it's highly unlikely FunC will have keywords starting with $.