Apply Java 8 Functional types and Lambdas to simplify parsing logic in Repository configuration [DATACMNS-1261]

[spring-projects-issues]

John Blum opened DATACMNS-1261 and commented

Refactors and cleans up some code in the Spring Data Commons Repository abstraction and specifically, the configuration and parsing logic, by applying Java 8 Functional types and Lambdas to improve readability

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Referenced from: pull request #274