feat(wrappers): generate constants in wrappers

[i582]

Issue

Closes #2032.

Checklist

• 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

[verytactical]

Extending the writeTypescript interface is a really sad thing to do. I wish we could keep it at just the ABI.