Add rule validations

[ashokaditya]

What is the purpose of this change? What does it change?

Makes all validation checks on mandatory and non-mandatory fields (if changed) before a user can add rules. Adding rule action won't be enabled unless all fileds are vali.

Was the change discussed in an issue or in the forum before?

37

Are other people/devs interested in this?

@TanguiC @loregood @uninth @kaspersort

PR Checklist

• [x] I have read the Contribution Guidelines
• [x] I have added tests for all changes in this PR
• [x] I have run npm test on the for all commits
• [x] I have added documentation for the changes
• [x] All commit messages are formatted in the same style as described in DeiC Styleguides
• [x] I'm done, this Pull Request is ready for review