fix: Fix CFAST json representation

[Nurkambay]

Eclipse library treat Enum as a number instead of string, that's why tests are passing, but actual CFAST coming from COBOL LS contains numbers instead of Enum names

Checklist:

• Each of my commits contains one meaningful change
• I have performed rebase of my branch on top of the development
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have checked my code and corrected any misspellings

[slavek-kucera]

@SerializedName might be worth looking into.