support new config option mappersRelativeTargetDir

[HunterLarco]

By default, mappers must be siblings with the schema they represent. For example, if the schema file is /path/to/schema.graphql, the mapper file is /path/to/schema.mappers.ts. This extension allows mappers to reside in a different directory relative to the schema file using the pattern <schemaPath>/<mappersRelativeTargetDir>/<schemaName><mappersFileExtension>. This is useful for users which prefer to locate mappers in their own directory rather than interspliced with the schema files.

Testing

• unit tests in typescript-resolver-files are passing
• e2e tests are passing. Note that I've updated a pre-existing e2e test which already tests every mapper option. I've added this new option to the test and validate that output looks as expected.
• I've used a local build of this change in my own project and validated that the generated output builds and operates as expected.

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Latest commit: 1d47972

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[eddeee888]

Thank you!