Working wildcard usage within "graphqlSchemaPaths"

[ghost]

Is your feature request related to a problem? Please describe.
I like to separate each type to its own file, which means there are a lot of files to be mentioned individually.

Describe the solution you'd like
I just want the "graphqlSchemaPaths" to accept wildcards as the following ones "directory/**/*.graphql" where files are searched in any level within the specified directory and with every file name there is. I'd be happy to implement it if this gets the green light.

Describe alternatives you've considered
The alternative I am currently using is manually introducing each file which is a error prone and tedious procedure.