feat: support message types

[Torres-ssf]

Fixes TS-443

• Closes Support messagesTypes for the ABI #2347

Summary

This PR corrects the JSON ABI property name by renaming messagesTypes.message_id to messagesTypes.messageId, which is the correct name within a generated JSO ABI. The exhaustive-example contract has also been updated to include a method that generates entries for the messagesTypes array within its JSON ABI. A new test case has also been added to validate that the property is generated correctly.

Checklist

• All changes are covered by tests (or not applicable)
• All changes are documented (or not applicable)
• I reviewed the entire PR myself (preferably, on GH UI)
• I described all Breaking Changes (or there's none)

[github-actions]

Coverage Report:

Lines	Branches	Functions	Statements
77.16%(+0%)	71.81%(+0%)	75.77%(+0%)	77.27%(+0%)

Changed Files:

Coverage values did not change👌.