Adding two new changers for the sql-support plugin

[akshaisarma]

Merge request checklist

• I read the guidelines for contributing
• I didn't commited files in the dist directory
• Unit tests are OK
• If it's a new feature, I added the necessary unit tests
• If it's a new language, I filled the __locale and __author fields

This is a followup to #361 (comment). As you say, I am keeping our changes in a separate plugin but I'd like two new change events added to the sql-support plugin since I don't want to maintain a custom copy of it for my plugin. My plugin needs these changers to add its functionality when going back and forth from SQL. Do you think you can add these?

I just migrated these directly from my use-case. I realize it isn't symmetrical (one modifies the whole rule when going from SQL and the other modifies only the field part when going to SQL) but I wanted to hear your thoughts first.

[akshaisarma]

Thanks, @mistic100! Any rough timelines on an official release?

[mistic100]

⚠️ I will rename the "getSQLRule" event to "sqlToRule"