Grails: Support finder methods provided by FindByBooleanFinder

The "find<booleanProperty>By*" static persistent method. This method allows querying for instances of grails domain classes based on a boolean property and any other arbitrary properties. This method returns the first result of the query.

Example:
```
Account.findActiveByHolder("Joe Blogs"); // Where class "Account" has a properties called "active" and "holder"
Account.findActiveByHolderAndBranch("Joe Blogs", "London"); // Where class "Account" has a properties called "active', "holder" and
```
In both of those queries, the query will only select Account objects where active=true.

See class org.grails.datastore.gorm.finders.FindByBooleanFinder

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*Imported from [IDEA-80048](https://youtrack.jetbrains.com/issue/IDEA-80048) · Type: Feature · Votes: 0*
*Comments, attachments, dates and reporter are not part of the export — follow the link above for the full history.*

Start by reading org.grails.datastore.gorm.finders.FindByBooleanFinder and tracing how the IntelliJ plugin currently recognizes Grails finder methods. Check existing finder-method support and its tests before implementing recognition for findBy* methods. Done means both example forms resolve correctly and restrict results to the boolean property being true.

Written by the indexing model from the issue text.